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12 Gauge to 45 Caliber Shotgun Adapter

45 Caliber 12 Gauge Shotgun Adapters

(11 customer reviews)


45 Caliber Shotgun Adapters for 12 Gauge Shotguns

Adapters come in 4 Lengths

2 3/4″, 5″, 11″ and 18″

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

Select Length and Chamber below: 


45 Caliber Shotgun Adapters for 12 Gauge Shotguns

45 Caliber Shotgun Adapters Allow a 12 gauge Break Action Shotgun to use 45 Caliber Ammo.
Compatible with 12 gauge Break Action single as well as double barrel shotguns
For 3″ as well as 2.75″ Chambers
Rifle dimensions are .451″/.445″ with 6 lands and .145″ wide
1:12 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)
Comes with multiple O-ring configurations.  As a result,  easily achieving a good fit for 12 gauge shotguns.

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.

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Additional information


2 3/4", 11", 18"


LC, LC/.410, ACP, 410 ONLY


Black Oxide, No Finish (Silver)

11 reviews for 45 Caliber 12 Gauge Shotgun Adapters

  1. Alan Terpstra (verified owner)

    So far your product exceeds my expectations and it was really fast service

  2. Peter W. (verified owner)

  3. tracy bowlin

    Fast shipping well made product good fit very impressed looking forward to trying it out.

  4. george conner (verified owner)

    Wow, what a product, fast service, easy order, high marks. Haven’t got to shoot it yet but I am hiding more money from the wife for the 45 70 tube.😜

  5. Steven M. (verified owner)

  6. Earl Hodson (verified owner)

    It’s a great product, I would recommend it to others. Fast service!!

  7. Dillon Ives (verified owner)

    I couldn’t believe the accuracy I was getting from the 45 colt 18″ adapter. I really like the product and wish I knew about them years ago!

  8. Jesse d. (verified owner)

    I’m very happy with your products and I wish your business prosperity

  9. Catherine Fondacaro (verified owner)

    Great, I am looking forwards for my next perches with you. Thank you on your fast delivery. Great product.

  10. Jeffery F. (verified owner)

    Perfect for my scavenger single shot shotgun set up.

  11. Phil Cochran (verified owner)

    I bought the 45 lc version and so far, color me impressed! My wife and I were only able to put 25 rounds or so through it so far but we both love it already. With armscor “cowboy” loads we were able to consistently hit a medium sized water bottle at 15-20 yards with just the bead sight. I can’t wait to put good sights or a scope on this thing and see what it’ll really do with some handloads!

    • Chaszel (store manager)

      Thank you for letting us know. We appreciate you feedback.


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