Choke shotgun markings

933 posts · Joined 2012. #20 · Jul 29, 2016. Some trivia collector minutia - The choke words were stamped on the barrels prior to 1929. The transition from the barrel address from Ogden to St Louis began in 1929 and completed in 1930.

125 posts · Joined 2006. #6 · Sep 4, 2007. Hello. Choke on the fixed-choke guns by Boito is usually marked on the underside of the monobloc or barrels. Take the forearm off and remove the barrels. You should be able to see asterisks marked on the underside. FWIW: * = full. ** = imp. mod.Fountain. Those markings, in connection with Model 21s, have nothing whatsoever to do with screw in chokes. Winchester Model 21s were never built with screw in chokes. The WS-1/WS-2 fixed choke designation refers to "Skeet1" and Skeet 2," which are constrictions designed to produce optimum patterns at ranges of 20 yards and 30 …Aug 30, 2008 ... Choke, Notches. Cylinder, /////. Skeet, /////. Improved Cylinder, ////. Modified, ///. Improved Modified, //. Full, /. Then there's the ...Your distance from the target determines the choke you need. The choke of a shotgun determines shot string only. It has no bearing on shot speed (velocity) or ...Arikara. Correct. For a while in the Flues era Ithaca marked the chokes as a fraction -- 1/4. 2/4, 3/4 & 4/4. Mine is marked 2 on the right tube and 4 on the left. Pretty much standard choke selections for general hunting purposes. Thanks for the photo. your gun is apparently older than mine. My sn begins with 372XXX.If we have multi choked your gun, the chokes will have laser/etched markings showing the gun make and the numbers in the gun serial number. For example; a Miroku with serial no. 77205NP would be marked with M.77205 Close2454 posts · Joined 2006. #3 · Dec 6, 2007. The Franchi is an European made shotgun.Most European shotguns are marked with stars on the barrel as to the choke rather than being marked with the the words. On the barrel of the shotgun there should be a series of stars.One star /full,two stars improved modified,three …

Definition of Chokes. A choke is a tapered constriction of a shotgun’s barrel bore at the muzzle end. Chokes are used to shape the spread of the shot in order to gain better range and accuracy. They come in different types, each designed for a specific purpose in shooting. Definition of Skeet Shooting. Five notches on choke tubes refer to the restriction level of the shot patterns. Choke tubes control the spread of shots from a shotgun, with each notch representing a tighter shot pattern. A five-notch choke tube restricts the spread of the shot to a narrower pattern, making it ideal for long-distance shooting, especially for hunting and clay ...Aug 30, 2008 ... Choke, Notches. Cylinder, /////. Skeet, /////. Improved Cylinder, ////. Modified, ///. Improved Modified, //. Full, /. Then there's the ...Examples. The most common number on a choke tube is the choke size or diameter. Both factory and aftermarket choke tubes will show the diameter of the choke etched into the outside wall of the choke. Additional numbers can include the shotgun gauge and brand specific markings.1108 posts · Joined 2005. #11 · Jul 4, 2007. Fastarget is correct. Merkel chokes tend to run tight. My 1620 is marked VBZ/1/2 (IC/Mod), but the chokes patterned more like Mod/Improved Mod. I opened the IC barrel to skeet and the left barrel remains a tight Mod. It makes for a pretty versatile gun.

A shotgun barrel’s choke will be located at the muzzle end of the barrel and you will encounter them in two different designs. The oldest way is called a “fixed choke.”. Many side-by-side and older single barrels will have fixed chokes, meaning that their barrels have the choke constriction built-in to the end of the barrel at the muzzle end.Miroku Choke Designation. I am looking at purchasing a used Miroku 20 ga O/U with 26" bbls. It is marked *- and ** for chokes. My Browning chart says this is Improved Mod & Mod but this seems a bit odd for a 26" barreled shotgun. Did Miroku use a diffrent choke marking system?Mar 31, 2019 ... Hello, I need some help with a Savage 720 U.S. Military shotgun. I have a 720 Aerial training shotgun and it has **** asterisks on the ...Choke tubes control the dispersion of shot inside the shotshell. Without a choke tube added to the barrel's end, there would be no way to control the barrel's payload. The payload is the shot coming down the barrel, and that shot is concealed in a wad. If your shotgun barrel is threaded for chokes, don't ever fire the shotgun without placing a ...1. Gauge. The gauge marking on a Tristar choke tube indicates the shotgun gauge for which it is designed. Tristar choke tubes are available for various gauges, including 12, 20, 28, and .410 bore. It is essential to match the gauge of your shotgun with the corresponding choke tube for proper fit and function. 2.Check the barrel markings: The easiest way to tell what choke is in your shotgun is to check the barrel markings. The choke markings are usually located on the side of the barrel near the muzzle. The markings will indicate what type of choke is in the barrel, such as “CYL” for cylinder, “IC” for improved cylinder, “M” for modified ...

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Feb 17, 2024 · ATA shotguns typically use interchangeable chokes with varying degrees of constriction to effectively control the spread of the shot pattern. These chokes include but are not limited to full, improved modified, modified, improved cylinder, and cylinder. Contents [ show] Dec 3, 2016 · Improved cylinder: Offers a constriction of 0.010 inch, and is used to get a nice pattern up to about 30 yards. Like the aforementioned cylinder choke, it is also a popular choice with skeet, trap, and clay shooters. Modified: This choke provides a constriction of 0.020 inch, and is effective up to about 45 yards. I've found that some of the choke markings are not always accurate on my Uggie. Do yourself a favor and get a $40 gauge measuring tool from Midway or Brownels. I have a 12 gauge that was supposed to be IC / M. But when i measured it was more like M /M . Well, you might be surprised when you pattern it. Choke markings on Spanish guns …Are you in the market for a new home? Look no further than Mark Spain Homes for sale. With their extensive experience and commitment to customer satisfaction, Mark Spain Homes has ...Jul 1, 2015 · Identification (Notches, Stars, Alpha Code, or Color Band) Full Choke: I notch, or * star. Improved Modified: II notches, or ** stars. Modified: III notches, or *** stars. Improved Cylinder: IIII notches, or **** stars. A Benelli choke tube with 3 lines (III) is a modified choke. Beretta shotguns that use Mobil chokes will also show 3 lines to indicate modified. Browning choke tube markings are slightly different, and 3 lines means Improved Cylinder Lead or Modified Steel. The line markings on a choke tube can be found etched into the top edge of the …

Shotgun choke does as it sounds. Chokes. That is, it constricts or narrows the barrels of a shotgun. This has the effect of reducing the pattern so that the density of the pellets is increased, which gives a stronger result. Visualise shotgun choke in the same way as a camera aperture which opens or reduces to give more or less light.Rizzini USA would be able to help as well. I got it figured out. Briley's site had pics and measurements for the different Rizzini choke styles. The 28 gauge on the left is a Rizzini choke, the the 20 gauge in the middle and the 12 gauge on the right are both Rizzini plus chokes. The 20 gauge has different measurements to the threads than the ...There are a variety of choke sizes that restrict a shotgun’s bore to a greater or lesser degree. “Cylinder” chokes don’t constrict the bore diameter at all. “Full” chokes constrict the bore by about .035 inches. Between cylinder and full, “improved cylinder” chokes constrict the bore about .010 inches, “modified” constrict ...A choke is a tapered constriction of a firearm barrel at its muzzle end. Chokes are most commonly seen on shotguns, but are also used on some rifles, pistols, or even airguns. [1] Notably, some .22 LR match rifles have a constricted bore diameter near the muzzle. [citation needed] Chokes are almost always used with modern hunting and target ...Choke Notches and Their Meanings. The notches on a shotgun choke are there to indicate the constriction level and the resulting pattern it produces. Each notch represents a specific choke setting, allowing you to determine the amount of spread your shot will have.(RTTNews) - Today's Daily Dose brings you news about FDA's refusal to approve Aradigm's Linhaliq in its present form; Abeona's progress in its cli... (RTTNews) - Today's Daily Dose...The choke tube table above shows the diameters and constrictions you can expect for choke tubes and shotgun barrels for SKB 12-gauge shotguns compared to common fixed choke shotgun gauges. Knowing the diameter of a choke tube is important in order to identify choke tube constriction. The tighter the choke tube, the more …A small batch, high-end shotgun. Hand polished receiver with custom engraving and 24k gold inlays and exhibition walnut. Available in 12 and 20ga., 3" chambering. ... Choke Tube Identification. Choke tubes can be identified by the number and placement of small notches found on their muzzle (non- threaded) ends. O: Extra Full: I: Full: II:Vintage Shotgun Choke Markings. Unlike most manufacturers, Savage chose not to mark their shotgun barrels with standard choke markings of Full, Modified, Improved Cylinder and Cylinder. Instead they chose to use a series of asterisk (*) marks as code to specify the choke constriction of a given barrel. This code can be found …That is what the old Charles Daly I used to have was marked and that is what it was. You lie to the Government, it's a Felony, they lie to you, it's Politics! You are right. I have a Daly Miroku and it was choked Imp Mod (+-) and Mod (++) before Mike Orlen added tubes. I suspect that ++- is light modified.

Mar 31, 2019 ... Hello, I need some help with a Savage 720 U.S. Military shotgun. I have a 720 Aerial training shotgun and it has **** asterisks on the ...

When you open the gun, turn it sideways and there should be marks where the barrels go into the receiver. The marks should be something to the extent of *- or something like that. There is a thread at the top of this forum about Browning choke codes. Good luck! Open the gun and look on the left side of the Mono Block.The choke tube table above shows the diameters and constrictionsyou can expect for choke tubes and shotgun barrels for Lanber 12-gaugecompared to common fixed choke shotgun gauges. Knowing the diameter of a choke tube is important in order to identify choke tubeconstriction. The tighter the choke tube, the more constriction it has and the less ...What do the markings on chokes mean? Markings on chokes indicate the level of constriction, with designations such as Cylinder, Improved Cylinder, Modified, Improved Modified, and Full. 4. What is Cylinder choke? Cylinder choke has no constriction and provides the widest shot pattern. 5. What is Modified choke?The choke tube table above shows the diameters and constrictions you can expect for choke tubes and shotgun barrels for Benelli 12-gauge and 20-gauge shotguns featuring the Crio, Crio Plus, and Mobil choke systems. Knowing the diameter of a choke tube is important in order to identify choke tube constriction.Ned Schwing’s book, “The Browning Superposed”, Krause, 1996, is pretty much acknowledged as the bible for the Superposed. He lists the Browning choke symbols as: * Full *- Improved Modified ** Modified **- Improved Cylinder **$ Skeet *** Cylinder Bore. That said, on any old gun that might have passed through several hands, it always pays ...Dec 11, 2023 · I can find no other markings on the gun other than a "G" and "35" stamped on the bottom of the barrel where it is covered by the receiver when the gun is assembled, and also a "G" and "35" stamped on the inside of the receiver where it is covered by the barrel when the gun is assembled. There is no other serial number or choke marking on the gun. The second shotgun choke that worked really well in the field – in that it was effective and forgiving in use – was a standard Beretta Improved Cylinder Mobilchoke tube. This is a conventional shotgun choke with about five thou of constriction. With the duffer’s gun, I once accounted for 18 average pheasants for 17 shots.933 posts · Joined 2012. #20 · Jul 29, 2016. Some trivia collector minutia - The choke words were stamped on the barrels prior to 1929. The transition from the barrel address from Ogden to St Louis began in 1929 and completed in 1930.

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The choke tube table above shows the diameters and constrictions you can expect for choke tubes and shotgun barrels for SKB 12-gauge shotguns compared to common fixed choke shotgun gauges. Knowing the diameter of a choke tube is important in order to identify choke tube constriction. The tighter the choke tube, the more …If a shotgun has an improved-cylinder choke, the constriction in the barrel is 0.010 inches. If a modified choke, 0.020 inches. If an improved-modified choke, 0.030 inches. A full choke, 0.040 inches. Full choke will place 70 percent of the pellets from a shotshell inside a 30-inch circle at 40 yards. However, increasing the barrel constriction ...S. soreshoulder. 328 posts · Joined 2003. #2 · Nov 11, 2003. My Fox Model B had neither choke markings or a serial number, for that matter. Your gun is probably choked Modified-Full, although it could be Improved Cylinder-Modified. Take it to a smith...he'll have the gauges to make the determination.The choke tube table above shows the diameters and constrictions you can expect for choke tubes and shotgun barrels for SKB 12-gauge shotguns compared to common fixed choke shotgun gauges. Knowing the diameter of a choke tube is important in order to identify choke tube constriction. The tighter the choke tube, the more …The Europeans, just to be different, have a system of using asterisks or punch marks, starting with * for full choke, ** for ¾, *** for ½, **** for ¼ and CL for cylinder.A choke is a tapered constriction of a firearm barrel at its muzzle end. Chokes are most commonly seen on shotguns, but are also used on some rifles, pistols, or even airguns. [1] Notably, some .22 LR match rifles have a constricted bore diameter near the muzzle. [citation needed] Chokes are almost always used with modern hunting and target ...The choke tube table above shows the diameters and constrictions you can expect for choke tubes and shotgun barrels for Benelli 12-gauge and 20-gauge shotguns featuring the Crio, Crio Plus, and Mobil choke systems. Knowing the diameter of a choke tube is important in order to identify choke tube constriction.The diameter table above shows the diameters and constrictions you can expect for choke tubes and shotgun barrels of a specific make and type, as well as 12-gauge choke sizes in inches, 10-gauge, 20-gauge, 16-gauge, 28-gaug e, and .410 shotguns. The most popular choke systems are shown, which include Standard …Optima-Choke choke tubes will be marked Optima-Choke. The start of the threaded portion of the Optima-Choke tube is located a nominal 50.78 mm (2.00 inch) from the breech end of the choke tube. The length of the threaded portion is a nominal 15.9 mm (.625 inch). The major diameter of the choke tube thread is 20 mm (.787 inch). How to identify the right Choke Tube for your gun: Identification Methods. 1) Visual Method. 2) Choke Measurement Method. 3) Barrel Markings Method. 4) Serial Number Method. Choke Tube Constrictions chart. How can I identify which screw in choke tubes I should use in my Beretta shotgun: Mobilechoke, Optima-Choke, Optima-Choke Plus, or Optima ... A choke is a tapered constriction of a firearm barrel at its muzzle end. Chokes are most commonly seen on shotguns, but are also used on some rifles, pistols, or even airguns. [1] Notably, some .22 LR match rifles have a constricted bore diameter near the muzzle. [citation needed] Chokes are almost always used with modern hunting and target ...The choke tube table above shows the diameters and constrictions you can expect for choke tubes and shotgun barrels for Benelli 12-gauge and 20-gauge shotguns featuring the Crio, Crio Plus, and Mobil choke systems.Knowing the diameter of a choke tube is important in order to identify choke tube constriction. The tighter the choke tube, … ….

Jan 23, 2023 · Arikara. Correct. For a while in the Flues era Ithaca marked the chokes as a fraction -- 1/4. 2/4, 3/4 & 4/4. Mine is marked 2 on the right tube and 4 on the left. Pretty much standard choke selections for general hunting purposes. Thanks for the photo. your gun is apparently older than mine. My sn begins with 372XXX. Choke tube markings are a series of lines, notches, letters, ... Skeet diameters differ based on shotgun brand and choke system. Below is a chart showing the diameter of SK chokes by brand. Type: SK Diameter (inch) Beretta/Benelli Mobil: 0.721: Benelli Crio: 0.722: Beretta Optima Plus:The practical range is from 10 to 25 yards for lead and 15 to 30 yards for steel. Depending on things like manufacturer and age, an IC shotgun choke for a 12-gauge can range from 0.009 to 0.010 inches. This variation happens in three chokes related to the 12-gauge, as you will see in the skeet II and modified chokes.Apr 27, 2022 · There are a variety of choke sizes that restrict a shotgun’s bore to a greater or lesser degree. “Cylinder” chokes don’t constrict the bore diameter at all. “Full” chokes constrict the bore by about .035 inches. Between cylinder and full, “improved cylinder” chokes constrict the bore about .010 inches, “modified” constrict ... Jan 17, 2021 ... Choke Tube Install and removal explained as well as purposes for different chokes.The choke tube table above shows the diameters and constrictionsyou can expect for choke tubes and shotgun barrels for Lanber 12-gaugecompared to common fixed choke shotgun gauges. Knowing the diameter of a choke tube is important in order to identify choke tubeconstriction. The tighter the choke tube, the more constriction it has and the less ...Most double shotguns represented here. Double gun shotguns - Side by Side shotguns, and over under shotguns - Including drillings, double barreled rifles, SxS double rifles, combination guns. Makers - Darne, Merkel, Arrieta, Beretta, Browning, Holland, Purdey, Richards, Bernardelli, Parker, Fox, LC Smith, and most other double barreled shotgun, …The choke tube table above shows the diameters and constrictionsyou can expect for choke tubes and shotgun barrels for SKB 12-gaugeshotguns compared to common fixed choke shotgun gauges. Knowing the diameter of a choke tube is important in order to identify choketube constriction. The tighter the choke tube, the more constriction it has and the ...Jun 4, 2021 · I've put them into this ordered list so you can see where they fit into the size ranges: Cylinder (no choke) Skeet 1: Specialty choke for skeet shooting, a form of moving (clay) targets for shotguns. Constriction is 0.13mm/0.005in. barrel to muzzle, and patterns 45% at 40 yards, 75% at 25 yards. Choke shotgun markings, I've put them into this ordered list so you can see where they fit into the size ranges: Cylinder (no choke) Skeet 1: Specialty choke for skeet shooting, a form of moving (clay) targets for shotguns. Constriction is 0.13mm/0.005in. barrel to muzzle, and patterns 45% at 40 yards, 75% at 25 yards., A choke is simply a tapered constriction of the gun barrel’s bore at the muzzle end. The exit end of the choke is smaller by some dimension than the actual bore of the barrel. This difference is the amount of constriction. For example if the bore of the barrel is .730 and the exit dia of the choke is .710 you have a constriction of .020., To eliminate the additional holes, yet maintain the modified choke, I had 1/2" cut off by MIke Orlen a couple yeas ago. Thus, I can confirm that the rib is solid - at least out at the terminal end. Coincidentally, my barrel is …, Nov 11, 2003 · S. soreshoulder. 328 posts · Joined 2003. #2 · Nov 11, 2003. My Fox Model B had neither choke markings or a serial number, for that matter. Your gun is probably choked Modified-Full, although it could be Improved Cylinder-Modified. Take it to a smith...he'll have the gauges to make the determination. , Degree of choke, in this case 0.7mm constriction CHOKE 17.0 1924-> Liege Choke constriction, together with barrel dimension this can give a brief view of the choke. 1898 - 1924 Liege Mark for optional superior provisional proof. The mark was seldom requested 1892-1924 Liege Chamber dimensions in millimeters shotguns undergoing …, Neither open nor tight. This is the do-all choke. Improved Cylinder (IC): This moves to the more open end of patterns. It can be used for closer range clays, bird hunting at close range, and is ..., The tighter the choke the heavier the radial forces, the tighter the pellets are squeezed together so the pattern holds tighter over a longer distance. Conversely, the less restriction you have in the shotgun choke the more loosely the pellets are held together and the faster the pattern opens up. There you have it!, Vintage Shotgun Choke Markings. Unlike most manufacturers, Savage chose not to mark their shotgun barrels with standard choke markings of Full, Modified, Improved Cylinder and Cylinder. Instead they chose to use a series of asterisk (*) marks as code to specify the choke constriction of a given barrel. This code can be found stamped on the ..., I've put them into this ordered list so you can see where they fit into the size ranges: Cylinder (no choke) Skeet 1: Specialty choke for skeet shooting, a form of moving (clay) targets for shotguns. Constriction is 0.13mm/0.005in. barrel to muzzle, and patterns 45% at 40 yards, 75% at 25 yards., Feb 17, 2024 · ATA shotguns typically use interchangeable chokes with varying degrees of constriction to effectively control the spread of the shot pattern. These chokes include but are not limited to full, improved modified, modified, improved cylinder, and cylinder. Contents [ show] , 19 posts · Joined 2007. #14 · Sep 28, 2007. Actually, on all of the Yildiz, it's 5- Cylinder 4-Skeet 3-Improved Cylinder 2-Modified 1-Full. I actually work at academy, and many customers don't want to believe it, but if you look at their website, or Briley's for that matter, it shows the types of chokes and what not., The tighter the choke the heavier the radial forces, the tighter the pellets are squeezed together so the pattern holds tighter over a longer distance. Conversely, the less restriction you have in the shotgun choke the more loosely the pellets are held together and the faster the pattern opens up. There you have it! , Regular cleaning and inspection of your choke tubes are crucial for optimal performance and longevity. Here are the steps to follow: Clean and grease your choke tube at least twice annually using a soft cloth and a light lubricant, such as gun oil. Inspect the choke tube for any signs of wear or damage., The constriction of a Benelli choke tube can be determined by the markings or notches on the end, which indicate its level of tightness. ... Patterning your shotgun with different choke tubes and loads can help determine which combination produces the best results for your shooting needs., Optima-Choke choke tubes will be marked Optima-Choke. The start of the threaded portion of the Optima-Choke tube is located a nominal 50.78 mm (2.00 inch) from the breech end of the choke tube. The length of the threaded portion is a nominal 15.9 mm (.625 inch). The major diameter of the choke tube thread is 20 mm (.787 inch)., Sep 25, 2019 ... Shooting forum · Shotguns - 12 gauge, 28 gauge, 410 bore etc. Miroku choke markings & steel. Double barrel, side by side, over-under, semi ..., There were no choke markings on A.H. Fox Gun Co. guns. Here are the Sterlingworth pages from a 1919 A.H. Fox Gun Co. catalog. 1919 Sterlingworth picture.jpg., The only stampings under the barrels I can see that might indicate choke are, **- on the right barrel & ** on the left. Those are the choke markings. The right barrel is the most open, just one increment less tight than the left. Not sure, but likely modified and IC. Full, I believe was 3 *'s and the - means one increment less., Weeds can be a nuisance in any garden or lawn. They can quickly take over and choke out other plants, making it difficult to keep your garden looking its best. Fortunately, there a..., Understanding the Notch System. The notch system used can vary between manufacturers, but most commonly, a single notch indicates a full choke, suitable for long-range shots with a tight shot pattern. Two notches typically represent an improved modified, providing a slightly wider pattern., About 40 percent of a shell’s total pellets will fit in a 30-inch circle at 40 yards without constriction. You will want to keep targets close with an open choke; within 25 yards is ideal. At 25 yards, you will have a 40-inch spread with a cylinder choke. Open or Cylinder Chokes have no constriction at all., Our choke tubes are precision made with tight tolerances on state of the art CNC equipment. Trulock’s has a quality control program that is second to none. We produce the choke tubes in our factory in Whigham Ga. from U.S. produced steel. Trulock offers shotgun choke tubes for any shooting activity. We make over 2,000 different shotgun …, Shotgun choke markings can be identified using 5 simple methods. They include referencing a sizing chart to find the correct choke, counting the lines or notches, observing dots or circles on the choke, locating writing on the side wall, and using bore …, Arikara. Correct. For a while in the Flues era Ithaca marked the chokes as a fraction -- 1/4. 2/4, 3/4 & 4/4. Mine is marked 2 on the right tube and 4 on the left. Pretty much standard choke selections for general hunting purposes. Thanks for the photo. your gun is apparently older than mine. My sn begins with 372XXX., ATA shotguns typically use interchangeable chokes with varying degrees of constriction to effectively control the spread of the shot pattern. These chokes include but are not limited to full, improved modified, modified, improved cylinder, and cylinder. Contents [ show], Home. Shotgun choke chart by type, use and distance. Shotgun Choke Chart. From novice shooters to seasoned hunters, chokes are a critical component to getting the best out of your shotgun. Shotgun chokes are interchangeable tubes, installed at the end of a shotgun’s barrel that shape or narrow the shot pattern., Mar 30, 2023 · The choke tube table above shows the diameters and constrictionsyou can expect for choke tubes and shotgun barrels for Winchester 12-gaugeshotguns compared to common fixed choke shotgun gauges. Winchester shotguns have two different choke systems. Some models are compatible with Invector style threads, while others have Invector Plus style threads. , I was thinking that those markings were I/C & Mod. On every Beretta O/U shotgun with fixed chokes I or my brother owned. The tighter choke was ..., Dec 11, 2023 · I can find no other markings on the gun other than a "G" and "35" stamped on the bottom of the barrel where it is covered by the receiver when the gun is assembled, and also a "G" and "35" stamped on the inside of the receiver where it is covered by the barrel when the gun is assembled. There is no other serial number or choke marking on the gun. , Vintage Shotgun Choke Markings. Unlike most manufacturers, Savage chose not to mark their shotgun barrels with standard choke markings of Full, Modified, Improved Cylinder and Cylinder. Instead they chose to use a series of asterisk (*) marks as code to specify the choke constriction of a given barrel. This code can be found stamped on the ..., ATA shotguns typically use interchangeable chokes with varying degrees of constriction to effectively control the spread of the shot pattern. These chokes include but are not limited to full, improved modified, modified, improved cylinder, and cylinder. Contents [ …, Basics. The basics of what choke tubes are and how they are used. What is a choke tube? How a choke tube works. Choke tube patterns. Choke Systems. Common choke systems installed on popular shotguns. Each page lists choke sizes, compatible shotguns, and choke tubes that fit the respective choke system. Benelli/Beretta Mobil. Crio Plus., Deciphering Auto 5 metric choke markings. I recently acquired a 16 ga. pre-War Auto 5 with a serial number in the 51,000 range. It does not appear to have the asterisk-style choke markings, but on the underside of the barrel it is marked as shown. I am assuming that this might represent a choke with a 0.1 mm constriction (16.9/17.0 mm).