12ga to 9mm back

9mm 12 Gauge Shotgun Adapters

(138 customer reviews)


9mm Shotgun Adapters for 12 Gauge Shotguns

Adapters come in 4 Lengths

3″ 5″, 11″ and 18″

All Adapters are Fully Rifled with a 1-12 or 1-18″ Twist.

Select Length below: 
SKU: N/A Categories: , , Tags: , ,


9mm Shotgun Adapters for 12 Gauge Shotguns

9mm Shotgun Adapters Allow a 12 Gauge Break Action Shotgun to use 9mm Auto in addition to Luger Ammo.

For 3″ Or 2.75″ Chambers

Compatible with Break Action single as well as double barrel shotgun.

9mm Shotgun Adapters Heavy Duty Steel Construction

Rifled:  with a 1:18 twist rate for the 11″ and 18″

1:12 twist rate for 2 3/4″ and 6″


9mm  Auto Shotgun Adapters Comes with multiple O-ring configurations.  As a result,  easily achieving a good fit for 12 gauge shotguns.


Black Oxide coating as a result provides notably better corrosion protection (for maximum corrosion protection keep a thin coat of oil on the insert)

What are 9mm Shotgun Adapters?

Shotgun Adapters frequently called Chamber Reducers or Shotgun Barrel Inserts. Our shotgun adapters allow you to use other types of ammunition in a Break Action Shotgun. Including double barrel and over and under double barrels in addition to the popular single barrel break action. We offer several different versions to suit your preference in ammunition, as well as length. 12 and 20 Gauge shotgun adapters are our most popular adapters followed closely by the 410. 16 Gauge is something we plan on expanding in the future.


9mm Shotgun Adapters

Most of our shotgun adapters come in different lengths to suit your needs. Some like the secure storage and portably of Shell length adapters. Whereas some are looking to get the most fps (feet per second) or accuracy out of their adapter. Black Oxide has become our standard finish. We can offer unfinished adapters during our production if you have requested one.

FPS (Feet Per Second)

9mm Shotgun Adapters
As a general rule, the longer the adapter, the more FPS it produces. However, with low-pressure rounds such as the 45 colt, the fps difference is minimal once past the 11″ length. If you are interested, here is an excellent website that gives a good idea of fps per inch BBTI. All of our shotgun adapters are entirely made in the United States and are an affordable addition to your break action shotgun. Thank you for you interest in our Shotgun Adapters or Chamber Reducers. We are working to make more adapters for more calibers, so you can sign up to be notified here
The video below gives a brief demonstration of how they work.

We are working to make more adapters for more calibers, so you can sign up to be notified here. Thank you for your interest.


If you like 9mm Shotgun Adapters, check out our other Shotgun Adapters

Additional information

Weight N/A
Dimensions N/A

2 3/4", 6", 11", 18"

138 reviews for 9mm 12 Gauge Shotgun Adapters

  1. David B. Boyster (verified owner)

    Received the 9mm adapter yesterday, and it works great. Very nice product.

  2. Michael (verified owner)

    Excellent product. Just plain fun to target shoot a 9mm from a 12 gauge break action shotgun. Surprisingly very accurate from 25 yards. I highly recommend the Chaszel 9mm shotgun adapter.

  3. robert rogers

    I can shoot a egg at 200 yards with this adapter in my 12 gauge with a 10-24×50 scope. Wow!

  4. Julie (verified owner)

    I love it! It exceeds expectations. I am very interested in the 10mm, 45acp, 357 mag, 22mag, 22LR and 300 blackout versions.

  5. Joe Harris (verified owner)

    I’m beyond pleased. The material quality and tolerances are both excellent. This is a properly engineered tool and the price was fair. I’m glad I ordered it.

  6. DENNIS (verified owner)


  7. Aaron B. (verified owner)

    High quality, accurate, excellent service.

  8. Roland S. (verified owner)

    Fits perfect, very accurate, easy extraction of brass

  9. Brian (verified owner)

    This insert is horribly inaccurate. Can’t hit a group within 6″ at 25 yards through my double barrel shotgun. With that same gun I can launch slugs at 50 yards into a 3″ group. I don’t understand what the problem is. Defective insert ??

    • Chaszel (store manager)

      Hi, I’m sorry to hear that you are not getting good groupings with your adapter. Here are few suggestions to try :

      1st: Adjust the muzzle orings so that the adapter has a tight fit.

      2nd : Find the point of impact that you prefer by indexing the adapter around in the chamber. While doing this use a cardboard target and check each shot to make sure it is not keyholing (bullet tumbling leaving a rectangular shape). If it is keyholing then do not use this position. Once you find your preferred index, mark the adapter so you can insert it to the same position every time.

      3rd: To achieve maximum accuracy once you have your index you can mark where your extractor is then file or dremel that portion of the rim so the extractor does not remove the adapter.

      If you still have no luck you can return it and I will check it out and send you a replacement if it has issues or refund you if i can find an issue. Also if you just don’t want it for any reason send it back and I will send you a refund.
      Hope this helps and know that I do appreciate your business.


  10. Verified Buyer (verified owner)

    These things are precision made. Very high quality. Fast shipping.

  11. john morton (verified owner)

  12. JAMES (verified owner)

    Excellent product, shipped fast and as always, pleasant to deal with. Notification the product was available was and is nice.

  13. Perry Copley (verified owner)


  14. Charles Moore (verified owner)

    Great product. Was very pleased with accuracy and ease of use. Hand loaded some HP and headed out to the woods. Put about 70rds through it without any issue. Was worried that the brass my get a little tight after firing but every one I was able to remove with just my fingers. Stop thinking about it and just get it. Will be recommending to friends and will be purchasing other inserts in the future.

  15. William Powell (verified owner)

    Beautiful fit and finish. Accurate beyond belief. Very easy to load and extract casing.

  16. Larry (verified owner)

    Nice Machine Work! I will be purchasing more of different calibers.

  17. Daniel Dearmond (verified owner)

    Glowing review. I now have 7 different inserts. I am just thrilled

  18. Scott F. (verified owner)

    Very satisfied with the process from start to finish…

  19. Brian (verified owner)

    Giving new life to my old 12ga single shot truck gun ….. I received my 11″ 12ga – 9mm adapter today and am very pleased with the product. Extremely well made adapter. Excellent machining, well finished rifled barrel on it. Item arrived quickly and came with a small sealed bag with their card and extra O rings!!!
    This is the third Chazel barrel adapter and I am very pleased with all three of them…. Chaszel makes a high quality product! Chad Waters is great to work with ; Made right here in the USA !!!

  20. John M. (verified owner)

    These adapters are very accurate. Well worth it for a more versable gun. I didn’t have no plinking ammo just Federal JHP in 147 Grains. I was able to get a 1/2 to 3/4 inch group out to 40 yards with a Stevens turkey gun 12 Gauge with scope couldn’t go further due to I ran out of yard. I know I could get good grouping further out. And I wouldn’t hesitate to try on a piney woods rooter (Hog)

  21. william B. (verified owner)

    Item came in a timely manner and functions as advertised!

  22. Anonymous

    This adapter is awsome I can ring a 10in steel plate at 70 yard + it’s crazy how accurate it is with just a bead sight…I’m a big fan

  23. Roy D. (verified owner)

    I am happy with the accuracy. I am looking forward to ordering other adapters, when they become available. Soon I hope

  24. Anonymous (verified owner)

    Great product for the price better then similar products.

  25. Anonymous (verified owner)

    I was impressed with the accuracy. Quality built. Fast shipping. You won’t be disappointed.

  26. Anonymous (verified owner)

    high quality and it’s American Made thank you.

  27. Herb S. (verified owner)

    Excellent fit snd finish

  28. James Ballou (verified owner)

    The 9mm insert is a great item to have, given how 9mm ammo is probably the cheapest (and most common) center-fire ammo available, and especially exiting an 18-inch barrel, its ballistics would be formidable. I’m really glad I was able to get this insert.

  29. jeffrey w. (verified owner)

  30. Robert (verified owner)

    Makes my Pedersoli side-by-side all that more enjoyable. Nice bit of kit, don’t hesitate to order if interested.

  31. Anonymous (verified owner)

  32. Tim Havens (verified owner)

    Great insert.The 18 inch barrel really allows you to get more distance and accuracy from a 9mm!

  33. Robert (verified owner)

    Using this in a 20″ side-by-side and I gotta say it’s a lot of fun. Once I got sighting figured out I was able to get consistent results at 25 yards with just the bead.

  34. Jeff M. (verified owner)

    I really like the two that I have the 9mm & 40 more the likely to buy more in the future. Thanks

  35. Reid P. (verified owner)

    Very accurate in my RIA. Using 115 grain plated round nose I can shoot a quarter size group of 5 at 30 yards. Recommend the 11”!!

  36. Thomas Birch (verified owner)

    fits well, I have not used it yet, so can not comment on that.

  37. Michael (verified owner)

    I have been satisfied with all of my adapters I have purchased.

  38. Anonymous (verified owner)

    Incredible craftsmanship. Adapter is a work of art. Chaszel is top tier in the gun industry.

  39. Michael (verified owner)

    As described super nice build quality. Thanks!

  40. Thomas Mccormack (verified owner)

    Prompt service

  41. Anonymous (verified owner)

    Love it, high quality, good accuracy, fast shipping

  42. Clint (verified owner)

  43. Anonymous (verified owner)

  44. David Gomez (verified owner)

  45. William Albert (verified owner)

    Fast shipping. Quality work, accurate, and easy yo use. Really makes my survival shotgun multi purpose.

  46. Timothy (verified owner)

    As advertised. Fit & finish are excellent.

  47. Peter notargiacomo (verified owner)

    These adapters are the best by far and also great support with any questions or problems

  48. David Yates (verified owner)

    Well pleased! Would order again. Thanks!

  49. Michael Hendrickson (verified owner)

    Fits my Midland 18 inch barrel nice. Still trying find time to shoot it.

  50. Steve Dill (verified owner)

  51. walter d (verified owner)

    the best shotgun adaptors on the market.

  52. George Snell (verified owner)

  53. Nicolas (verified owner)

  54. James Burke (verified owner)

    Thank you Chaszel for the super fast service. And thank you for the Chaszel 12 gauge to 9mm “versatile” adaptor. Unknown by some who’s reviews that I have read in regards to shotgun adaptors in general, this wonderful item is all about “adaptability and versatility”, not absolute and quantitative accuracy.
    There are some gun owners who are expecting some sort of pin point marksmanship accuracy with this or similar products.
    This adaptor is a product that enables one to utilize an ammunition that you may have as a secondary ammo source and effectively use that ammo in a shotgun. It’s as simple as that!!! Again, this item is all about utilizing “versatility” with your existing weapons and ammunition.

  55. Michael Macsurak (verified owner)

    It is ALL you said!!!!! Fit and finish superb

  56. Howard (verified owner)

    As with your other adapters.. another home run 🎉👍

  57. Yul Rowe (verified owner)

  58. Matthew Miller (verified owner)

    Fast shipping. Exactly what I was looking for. Performed way better than I was expecting. Will order again

  59. Curtis Engle (verified owner)

    100 percent satisfied

  60. Kelvin (verified owner)

  61. Anonymous (verified owner)

    Just what I was looking for, versatility!

  62. Carey P. (verified owner)

    Good as always.

  63. Curtis F. (verified owner)

    Great product , great price!

  64. Ronald Barrett (verified owner)

    All that was available at time of purchase was the shortest version. Although it’s fun to play with, it’s not as accurate as i’d hoped. I’ll probably get the 18 inch version later to try to get minute of squirrel head accuracy. Only getting minute of beer can accuracy now.

  65. Alan T (verified owner)

    My second adapter from Chaszel. Very pleased once again. Chaszel is the best and my only choice (I tried others). Patiently waiting to order some 11″ adapters!

  66. John (verified owner)

    You did a great job of sending it

  67. Clay (verified owner)

    The 12ga to 9mm shotgun adapter is excellent, even better than I expected. I’m shooting it through a 20″ barrel and at 25 yards it worked perfectly as expected so then I took some shots at my 200 yard rifle target. Once I figured out where to hold it was remarkably consistent. Very pleased with this adapter.

  68. Robert K. (verified owner)

    Great product! Excellent workmanship! I will buy again!!!!!

  69. Steven F. (verified owner)

    outstanding service and a great product..!!

  70. Peter Johnstone (verified owner)

    A1++, as always👏👍

  71. Kevin Thiery (verified owner)

    Have not had a chance to shot it. But it is installed in my shotgun. I like that it is longer than any other one I found. I hope it is more accurate than the little stubby ones. So far very Happy!

  72. Kevin (verified owner)

    Amazing product

  73. glenas mckiddy (verified owner)

    Excellent Product

  74. Anonymous (verified owner)

    I love these things this company does a GREAT JOB with these adapters!!!!!!!!!!!!!

  75. George drndarski (verified owner)

    9mm Excellent product well don Works greet Compering to other MF the price was the same bot quality of the other MF not possible to compare weary baaad

  76. Claude P. (verified owner)

    I am very happy my 12ga to 9mm adapter. It is a very high quality product and is very accurate. I will buy more of these adapters, as the particular ones that I want become available. Very satisfied and will be a repeat customer.

  77. Mark Risley (verified owner)

    Haven’t had a chance to shoot it yet, but both of the other adapters I purchsed from Chaszel have been fun to shoot from my New England 12 gauge single shot. I have a .38/.357 and a .44 magnum 18″ insert so far.

  78. Bradley Dolby (verified owner)

    Absolutely great products and service!

  79. Daniel Robinson (verified owner)

    I love the 9mm 18″, fires straight, just works perfect in my break action 12 gauge. I also have the 45-70, and 45 acp – both in 18″. I’m patiently waiting for the 7.62×39, and the 22lr in 18″ and checking every day…I missed the last time around, and regret not getting it when I could.

  80. Robert B. (verified owner)

    I have puchased 6 of these in various calibers and lengths and have finally shot them enough to form an opinion. Quality is great, they are what they are though. I have 3 shotguns a Marlin , a winchester/cooey, and a cheap turkish import. The pistol caliber inserts work well in all three ,and i find that a red dot sight with a lo–oong eye relief mount works out great since every time you swap you need to re-zero. The 30/30 works great with the marlin , but will misfire in the cooey or turk unless i reload with pistol primers, if you are using a higher pressure cartridge dont expect a cheap break action to work well.

  81. Jonathan Johnson (verified owner)

    Order still hasn’t arrived. Was shipped on 4-10 , last usps tracking was 4-14. Would like another item shipped or a full refund. Thank you

  82. Peter Johnstone (verified owner)

    My 7th insert – all very well made and quickly delivered. Looking forward to the 30-30, 45-70 & 7.62×39 coming on line again. Also, suggest 40sw & 30 Carbine would be good – I’d buy immediately!

  83. Jerry (verified owner)

    Well built and works great

  84. Jeff G. (verified owner)

    I have bought a lot of these inserts in different calibers and happy with everything I’ve gotten so far.

  85. Forrest (verified owner)

    Arrived on time and well packaged. Easy install and very accurate.

  86. Donnell Murrin (verified owner)

    great quality

  87. Thomas Ames Petty (verified owner)

    I just got the 18″ 9mm barrel and upon receiving it I saw the quality and knew this was going to be fun with just a front bead on my 12 ga. I was able to get ragged hole groups at 20 yds, they were low but I’m looking forward to getting a red dot sight mounted to the barrel. I will be ordering more of these in various calibers.

  88. Brandon Meyer (verified owner)

    Very accurate fit snuggly in my 12 gauge single shot had three to four inch groups at 20 yards with shotgun bead

  89. Matthew Buvala (verified owner)

    I received the adapter. I like it just need to sight it in, I’m using it in my 223 over 12 ga. savage mod 24 rifle. My plans are to purchase a few more in the future.
    Thank You

  90. Daniel B. (verified owner)

    I’m so happy I did my research before buying this! Out of all the brands you folks are way above the rest. The quality and finish on this piece are above expectation. It turned my cheap $100 shotgun into a sweet little carbine. Perfect for teaching my grandsons some basics.

  91. vaughn (verified owner)

    really like this barrel . picked up 250 fps over handgun shoots 2″ groups at 50 yds and can reach out to my 150 yard gong plate 10″ almost every shot.

  92. David (verified owner)

    Great product! Not some cheap eBay adapter, quality material, works great and accurate

  93. Cuautemoc Romo (verified owner)

    Works great. And, they give you extra “O” rings with your purchase. Have it for my Baikal M18

  94. Anton K. (verified owner)

    nice well crafted equipment. I am using it with Browning Cynergy with no issues.

  95. Richard (verified owner)

    This is a great way to make an unusable shotgun into something useful.

  96. Anonymous (verified owner)

  97. Gerald C. (verified owner)

  98. Ian H. (verified owner)

    I am amazed by the 12ga to 9mm. I will buy all the adapters you make soon as the come in stock. I’m already on the waiting list. Best $ I’ve ever spent

  99. Eric (verified owner)

    Great workmanship, perfect fit.

  100. James Mullett (verified owner)

    Does a good job of what it’s intended for . Accuracy is decent for a reasonable distance. Came with extra o-rings. Good snug fit in the chamber as should be. Thanks.

  101. Francis Pratt (verified owner)

    Amazing product, could not be more happier. This is extremely accurate, it really surprised me. Very fast shipping, and excellent customer service as well.

  102. William B. (verified owner)

    Arrived before expected. Fit perfectly. Haven’t fired through it yet, but soon. I’m excited to have the adapter. I now have two ‘weapons’ vice one.

  103. Douglas Soucier (verified owner)

    Easy transaction, quality product, and, most impressively, available items in these uncertain times. A+

  104. Anonymous (verified owner)

  105. Martin Kennedy (verified owner)

    Ordered this on a Saturday and it’s at my house on Monday! This is how business is done! Product was as described.

  106. Anonymous (verified owner)

    The owner, Chad, went beyond his way to ensure that I am happy with the product. Highly recommend!

  107. Donald (verified owner)

    Outstanding quality.

  108. Patrick T. (verified owner)

    You guys are amazing and I’ll be buying tons of more adapters

  109. bruce (verified owner)

    Nicely made, looks pretty. Now reality is the rim is too thick for my Model 37 to close on it; not what I wanted.
    It works great in my Mossberg 500(take O-rings off). Very strong, I ran a bunch of overloaded, primer blowing reloads through it without incident(do not do this). Very accurate for a such a short barrel, and has a nice tight match chamber. Bring a brass rod with you to punch out sticky brass. Great for plinking or hunting up close(less damage than a slug). So easy to make they should offer other chamberings.

  110. Fred Tuckey (verified owner)

    Craftsmanship looks top notch. Haven’t had time to shoot yet.

  111. Ronnie m. (verified owner)

    Very nice. Waiting on more.

  112. Randy L. (verified owner)

    The adapter worked like it should .Use oil on it and sum in the barrel where the adapter goes…

  113. William Sims (verified owner)

    Very good quality, fits chamber well. A few test shot at 10 yards grouped about 2 inches. Can’t wait for mor calibers to become available. This is my second, first is a 30-30 – 18″, very pleased with it as well.

  114. Chris (verified owner)

    Great value!
    For right at $30 I had a quality (all steel, o-rings, protective finish, and rifled!) product shipped straight to my door.
    I test fired this product out of a 18.5” top break with Hornady Critial Duty +P 135gr flexlock. The muzzle velocity on the box was 1110fps. My chronograph muzzle velocity out of the 2 3/4” adapter was 1075!!!
    Top quality and well manufactured product! Tucked away nicely inside the buttstock.
    Chaszel also emailed me when the product was back in stock and shipped quickly. Buy! Buy! Buy!

  115. Sidney wilbur (verified owner)

    perfect as always, thanks

  116. Chris

    Great all the way around! Other adapters won’t fit in my Hatfield but the 9mm fit perfect! Got extra o-rings which was awesome! These adapters make u have better accuracy because u know you only have 1 shot to get on target! You can’t bet the price and quality of these adapters! My only complaint is other adapters I would like are out of stock!

  117. Matthew J (verified owner)

    Very nice for and finish!

  118. James Matteson (verified owner)

    Prompt delivery, quality device, and shoots acceptably. Very satisfied.

  119. Vincent Milton (verified owner)

  120. STEAVE K. (verified owner)

    Best Adapters in the market period!!

  121. Donald P. (verified owner)

    Great product. Have not had a chance to go to the range yet.I have one of your 357 18in adapters and I love it. If the 9mms shoots as well and I am sure it will I will be very pleased!

  122. Anonymous (verified owner)

    These are the coolest thing for a shotgun!

  123. John Hickey (verified owner)

    I’ve received four adapters in the last 90 days or so 12/44 12/ 45 20/357 and a 12/9mm and love them all . The adapters are beautifully made and the accuracy is moa of deer at 50 yards and more depending on you.I expected good punch from the larger one but was impressed with the 12/9mm out of the 18″. Eagerly awaiting 12ga. 30/30 !

  124. Michael (verified owner)

    Better than expected. Easy to pull spent casings and accurate when timed consistently.

  125. Lawrence Vanderplas II (verified owner)

    I’m very happy with this adaptor. I haven’t had the chance to take it to the range and test it out yet, but if it’s anything like the other Chaszel shotgun barrel adaptors that I own and have used that were excellent, then I’m sure that I’ll love this one also.

  126. William B. (verified owner)

    Great barrel adaptor shoots good at 50 yards with bead sight

  127. Mitchell Mensch (verified owner)

    Use for a snake shot gun 18″ barrel. Holds pattern of about 8″ at 10 feet very good

  128. Raymond Coffman (verified owner)

  129. Greg Conn (verified owner)

    Absolutely perfect and works like a charm.

  130. Michael Packard (verified owner)

    Awesome adapters very accurate

  131. John C. (verified owner)

    Awesome product at a fraction of the price of there competitors

  132. Charles Harsson (verified owner)

    Chad thank you very much i got your package, it worked i just wanted to say i greatly appreciate it & i will definitely be shopping with you & your fine adapters from here on out.

  133. Jesse d. (verified owner)

    9mm is a cheap round…. plinking fun for everyone

  134. Brian Blanchette sr (verified owner)

    Seems like a good value for plinking

  135. Charles Harsson (verified owner)

    Chad yes please that would probably work just fine I just ordered mine on the 8th of april so yall have my information.

  136. Charles Harsson (verified owner)

    I bought one of the 2 3/4 9mm-12 gauge adapters and it’s a really really tight fit in my nef single shot 12 gauge it has a 3″chamber so it should fit just fine, I also added a light coat of rim oil to the adapter but no luck it’s still a really tight fit, hopefully the more i shoot with it the more it breaks in and losings up in time….

    • Chaszel (store manager)

      I can will send you some slightly smaller O’rings to try if that is ok with you


  137. Michael (verified owner)

    Fits well. Shoots extremely accurate. I need to pry the 9mm luger casings out as they seem to case form to the 9mm auto chamber. A small flathead screwdriver suffices. It is not too hard at all.

  138. Robert Harwood (verified owner)

    By far the best adapters on the market. Even with just the 2 3/4″ I can shoot fist sized groups at 50 yards with open sights

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