12ga to 40s&w text

12ga to 40 S&W Shotgun Adapters

(14 customer reviews)


40 S&W Shotgun Adapters for 12 Gauge Shotguns

40 S&W Shotgun Adapters are Rifled with a 1:14 twist rate.

Available in 3 Lengths: 6″, 11″ and 18″



12ga to 40 S&W Shotgun Adapters

12ga to 40 S&W Shotgun Adapters Allow a 12 gauge Break Action Shotgun to use 40 Smith & Wesson Ammo.

Compatible with 12 gauge Break Action single and also double barrel shotgun.

Comes with multiple O-ring configurations.  As a result,  easily achieving a good fit for 12 gauge shotguns.
Rifle dimensions are .390″/.400″ with 6 grooves and .120″ wide with a 1:14 twist rate.
Black Oxide coating as a result provides notably better corrosion protection (for maximum corrosion protection keep a thin coat of oil on the insert)

Warning:   Not all shotguns are the same!  While the majority of them are capable of handling high pressure rounds, some are NOT.  Only use these rounds in shotguns that are compatible.  I recommend on any shotgun to test the first shot in a vice while out of harm’s way and to always wear eye and ear protection.  If after testing, you see the primer punctured in the round discontinue using this round and use a less powerful round. Some of these high-pressure rounds include: 45-70 gov, 357 Mag, Max, Sig, 327 Federal, 44 Mag, 9×23 Largo, 300 Blackout, 7.62×39, 7.62×25, 30-30 Win, 35 Remington, 10mm 40s&w 22 Hornet and 400 Legend.  Please always be safe and aware.

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.

12ga to 40 Smith & Wesson 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)

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. 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.

Additional information

Weight N/A
Dimensions N/A

6", 11", 18"

14 reviews for 12ga to 40 S&W Shotgun Adapters

  1. Richard G. (verified owner)

    Took it out today to shoot. Amazing to be able to shoot 40S&W like it was a rifle. Look forward to 9mm and 45LC/410 being available in 7 inch

  2. Anonymous (verified owner)

    This is a high quality shotgun insert but I hadn’t got to the range to try out the 40 S&W insert yet. I have four 18 inch 12 Gauge inserts chambered for 3030, 39×7.62mm, 44 Mag. and 357 Mag. and two 20 ga. 11 inch inserts chambered in 357 Mag. and 44 Mag. All of these inserts have the same high quality and every one is very accurate in my NEF single barrel shotguns.

  3. Charles B. (verified owner)

    I had a great experience. I would buy more products when they are available.

  4. Keith Bayless (verified owner)

    To be able to shoot multiple calibers out of one gun is a HUGE plus for me! I often tell others about these adapters and I have a friend who plans on buying them!

  5. jlpamckinney (verified owner)

    Works great. I want to get a another one

  6. Gary Pastor (verified owner)

  7. Louis Orman (verified owner)

    Very satisfied, been wanting that 40 Smith & Wesson for a long time very pleased with the quality work

  8. James Engelking (verified owner)

    Quick shipping. Easy check out. Highly recommend

  9. Andrew H. (verified owner)

    Was a repeat performer of the 20ga 38/357 adapter! 4″ plates at 50 meters all day with bead sight using 165gr FMJ Winchester white box. Will be buying 30-30 adapter when available for sure!!!

  10. Robert (verified owner)

  11. Paul T. (verified owner)

    After purchasing a 12/357mag adapter (very pleased with that one) I was excited to see the 12/40sw become available. Given my NEF break-open only has a single bead, that fact that either one can stay on “soda can” at 50+ feet is exciting. I also just picked up a 410/38sp as a gift for my brother and am waiting to get a review from him. I’ll keep you posted.

  12. John B. (verified owner)

    Just perfect

  13. Lawrence V. (verified owner)

    Though I haven’t had the opportunity to take this to the range yet, this 40 cal, 18 inch barrel adapter is very well made. If it is anything like the other 5, 18 inch barrel adapters that I have from Chaszel, I’m very confident that it will perform well. The rifling is solid. I love that they come with additional rubber o-rings to customize how securely the barrel fits inside my shotgun for better accuracy. Chaszel has been a legit company to do business with. Their customer service is excellent. I look forward to purchasing a few more barrel adapters from Chaszel as soon as they are available again. This company and their products are legit. I’ve shown these barrel adapters to lots of my friends and they are impressed.

  14. Arcy Swopes (verified owner)

    Been waiting on this one.👍
    You guys are fantastic.All I need now is one for the 17 home!!!!!

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