20ga to 9mm text

9mm 20 gauge Shotgun Adapters

(65 customer reviews)


9mm Shotgun Adapters for 20 Gauge Shotguns

Adapters come in 4 Lengths

2 3/4″ 6″, 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 Luger Shotgun Adapters

9mm Luger Shotgun Adapters Allow a 20 Gauge Break Action Shotgun to use 9mm Auto / Luger Ammo.

For 3″ as well as 2.75″ Chambers

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

Comes with multiple O-ring configurations.  As a result,  easily achieving a good fit for 20 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)

9mm Luger Shotgun Adapters Rifle dimensions are .355″/.349″ with 6 lands and .125″ wide.


What are 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.

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)

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 this product, check out our other Shotgun Adapters

Additional information

Weight N/A
Dimensions N/A

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

65 reviews for 9mm 20 gauge Shotgun Adapters

  1. Jeremy Stanton (verified owner)

    I wanted all of the sizes they have for 20 gauge, but they only had 4 in stock and don’t know when they’ll have more. I bought the 20 gauge because it was smaller and could use the adapters. Good luck finding them though. The product is great but only three sizes in stock when they make over 10 variations is not so great.

  2. James R. (verified owner)

    Nice tight fit, very accurate, however it doesn’t like steel cased ammo. Aside from that, I love it!

  3. John N. (verified owner)

  4. James (verified owner)

    A pleasure to do business with! Quality adapters at reasonable prices. I now own 2 of the 18″ inserts and am very happy with them. Great communication also. Keep up the good work!

  5. mike k. (verified owner)

    Works fine on my Rossi break open 20ga. Well packed and fast delivery. Will be back for more.

  6. Anonymous (verified owner)

    Haven’t shot it yet.

  7. Anonymous (verified owner)

  8. James (verified owner)

    I haven’t had a chance to use it yet! But I must say the craftsmanship is excellent!!!

  9. jonathan hill (verified owner)

    order came fast 9mmx 20ga fit great shot great !

  10. Gary S. (verified owner)

  11. Stuart Wood (verified owner)

  12. Warren lake (verified owner)

    It works ! Just need sight in .

  13. Roland S. (verified owner)

    Fits perfect, very accurate, easy extraction of brass

  14. Verified Buyer (verified owner)

    Great product, aways outstanding performance.

  15. Verified Buyer (verified owner)

    Quality made, fast shipping and accurate.

  16. Vinh-Doan (verified owner)

    Really like this product, I got the 11in version. I wish I had been able to get the size up (I think 18in), as I think it ultimately would have worked even better in my gun, and would have gotten better accuracy, and I have a barrel that accommodates that perfectly. I think they’re still unavailable as of now. But, as an 11in 20GA to 9mm adapter, this product gets 5 stars.
    That said, if you’re looking to save some money on this, want the more compact size, or physically need the shorter size for your barrel, this 11in adapter is really showing a lot of promise. I need to do some more testing, but it does appear that this can get decently accurate at 50 yards. Once I get consistent groups at this range, I’ll take it out to 100 yards.
    The only other thing I’m trying to figure out is the o-rings; I tried adding one to see if I could get a more snug fit in my gun, but I couldn’t get the adapter to fit properly after adding an additional o-ring. Based on what I felt when trying to get it to fit, I think that may be a limitation on my gun, not the product. Just something to keep in mind.
    FYI, I’m shooting this out of a Chiappa M6 20GA. If you have an M6 and are debating getting the Chiappa-made/branded adapters (they’re 7in), I think you’ll be happier with this one. They’re super well made, and these will get better performance in almost every respect, based on barrel length alone. There was just nothing that the Chiappa ones had over these ones from my point of view. Plus points because Chad is super nice, and it’s great to support such a great business. Even thinking about trying out other calibers! Strongly recommend!

  17. Wesley Hellums (verified owner)

    I would have preferred the 18″ but the 11 works fine. Waiting on full ramp up for more availability for more products

  18. Brian Weider (verified owner)

    Chad Waters is fantastic to work with!
    I received my 11″ 20ga – 9mm adapter today and am very pleased with the product. Extremely well made adapter. Excellwnt 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 second Chazel barrel adapter and I am very pleased with both of them…. thank you Chad, it is great to work with you! Great product!

  19. Alaric (verified owner)

  20. DOUGLAS GREER (verified owner)

  21. Jerry Adams (verified owner)

    My 20ga. to 9mm adapter is machined to precision and gives amazing accuracy in my shotgun. I am very pleased with it.

  22. Stephen (verified owner)

    Great piece, fit and works, accuracy better than expected

  23. John (verified owner)

    Very nice machining, rifled barrel on it. Came with a small sealed bag with their card and extra O rings.
    Customer service was very good as well, they could have pushed me toward a more expensive option but said for my situation, the one I got was the perfect fit.
    Will definitely buy again.

  24. jay wysong (verified owner)

    Great product, wish you had other calibers in stock.

  25. Joe Dickey (verified owner)

    Seems to shoot to just a couple inches above POI in two guns. Very happy and want warm weather for further testing. Shipping was quick and secure!! HAPPY!!

  26. Alfred T. (verified owner)

    Item shipped promptly. Very pleased with insert. Planning on purchasing a different caliber in the future.

  27. Richard E. (verified owner)

    Same as my other comment, except for both shipping was quick

  28. Jeff G. (verified owner)

    I have bought about 30 of the different inserts. Yes, that’s a small fortune spent on them but the ones I have used are all good and perform well once you get them clocked in the barrel for more accuracy. Have been lately buying the ones for the 20 gauges as they and barrel actually are lighter total weight than the 12 gauge and insert. Have a couple R.I.A’s set up with the 410/45LC inserts and they make the best survival one I’ve found as when in the woods you don’t have to switch out the insert to shoot a gauge verses caliber. Use 410 shells for birds and small game and 45 Long Colt for deer in the brush. Best accuracy with the 18 inch length. No complaints on anything I’ve used.

  29. Anonymous (verified owner)

    Excellent shotgun barrel adapters. I carry the 11 inch adapters in my game vest when hunting with my single barrel 20 gauge.

  30. Russell M. (verified owner)

    Great addition. Took this out last week and it was dead on out to 50 yards. It had a couple of issues with the shell case getting stuck, but I think that was the ammo type more than the adapter. Looking at purchasing others adapters when they come available. Thank you for a great product.

  31. Stephen (verified owner)

    I found this adapter to be very satisfactory ! The quality of workmanship is surprisingly good, it shoots consistently, and is easy to manage.. I plan to purchase more of these adapters.. they’re fun.

  32. brian b. (verified owner)

    Chaszel Mfg. Co. is a great resource for obtaining Shotgun barrel adapters. Workmanship is excellent, shipping timely, and products work as expected. Will be ordering other adapters for sure. A positive result.

  33. Carey P. (verified owner)

    Shoots good. Cases mostly come out easy. 🙂👍👍 Accurate.

  34. Anonymous (verified owner)

  35. terry cannon (verified owner)

    I love it. I am using it in an over/under Chiappa 22/20 gauge. I have been target shooting with it and shooting repeatedly low and to left. I am dead on with the 22 Must be me flinching. I am considering another caliber for my 12 gage Slugger. I am a big fan of single shot break barrel guns. Especially with the price of Ammo.

  36. Stephen (verified owner)

    Very good excellent quality, nice workmanship, fits perfect!

  37. Darin

    I got the 18 inch 9mm adapter for 20 gauge break action single shot. Lots if fun and much more accurate and powerful than pistol. Service and deliver were top notch.

  38. Peter Johnstone (verified owner)

    Well made. Shoots quite well.

  39. Roy B. (verified owner)

    Looks great, I have not actually used it yet. The customer service was great.

  40. Peter Johnstone (verified owner)

    Used it (18” x 9mm) yesterday at 25 & 50 yards. Gave me 2” at 25 and 4” at 50. ‘Iron’ sights on an H&R 20ga. Very well made and finished. Easy to use. Very pleased. Wish I’d known of these long ago. TY!

  41. Randall Weinley (verified owner)

    Would love to buy other calibers when available.

  42. Anonymous (verified owner)

  43. david s. (verified owner)


  44. Paul Hodges (verified owner)

    Excellent quality

  45. Robert S. (verified owner)

    Initial test on the range was very promising. Looks to be an excellent addition as part of a “9mm” carbine project on a slug gun.

  46. Anonymous (verified owner)

    Ya’ll did great, the Post Office, well thats another story. Can only imagine what their priority might be.

  47. Paul H. (verified owner)

    The adapter was a top notch quality. A perfect representation of the USA made quality product. Chad, the support rep, was quick to respond to all of my inquiries. I will absolutely make more purchases in the future and highly recommend to my family and friends.

  48. James Shingleton (verified owner)

    Super , I really like this item

  49. steven briggs (verified owner)

    Item came in good time and was well packaged.
    Adapter fit nice and snug, I haven’t shot it yet but when I do, I’ll give a review on that. That being said, I will be looking forward to buying one for my 16 ga.

  50. Frank Jennings (verified owner)

    absolutely delighted with both design and execution !!

  51. MATTHEW BUVALA (verified owner)


  52. John S. (verified owner)

  53. Anonymous (verified owner)

    Have not used them yet, but feel tight in gun…glad they are blued and marked with calibre’s….may buy some 12’s, 28, and .410 adapters soon…..Thanks….I like them..Great Price…..!!!!

  54. Richard Newell (verified owner)

    Quality workmanship. Great fit. Good accuracy. For a small investment, I transformed my shotgun into a 9mm rifle, yet it retained the characteristics of my original scattergun.

  55. Anthony P. (verified owner)

    I am very pleased with the accuracy of my Chaszel shotgun adapter. The extra cost for this 18-inch adapter is well worth it. It stirred much interest at my local gun range.

  56. Jacob (verified owner)

    Great products, fantastic customer service, quick shipping. Will buy more!

  57. Chuck (verified owner)

  58. Douglas (verified owner)

    I ordered the 11 inch 9mm insert for use in my 22 year old NEF 20 gauge shotgun. Order fulfillment and shipping were fast. I tried the insert out at 25 yards using 115 grain 9mm ammo. All shots were within 4 inches and were to point of aim. I have a fiber optic front sight on my shotgun which improves aiming but also reduces accuracy a bit. I am quite sure I would have better accuracy with a better sight on my shotgun.

  59. Cleaver (verified owner)

    Another great piece. It is far superior to other similar products I have seen.

  60. John Adams (verified owner)

    Received the adapter on time and in excellent condition, the quality of the adapter is second to none, excellent workmanship straight bore, crisp rifling, easy extraction of adapter and cases, i have a half dozen or so of these adapters and they’re all excellent.

  61. Anonymous (verified owner)

    Great quality product. Looking forward to other items as they become available.

  62. William Trader (verified owner)

    Very accurate out to 100 yrs.

  63. Paul R. (verified owner)

    I have the shortest 20ga-9mm and it actually shoots plenty accurately enough to secure game or in other scenarios.Great quality quick shipping and a company that stands behind their products made in USA what else could you want…

  64. Mark (verified owner)

    Great simple way to modify a firearm. Must have for a bugout scavenger gun.

  65. Bill Bieszk (verified owner)

Add a review

Join Waitlist We will inform you when the product arrives in stock. Please leave your valid email address below.