12ga 450 Bushmaster text

450 Bushmaster Shotgun Adapter

(7 customer reviews)


450 Bushmaster Shotgun Adapters for 12 Gauge Shotguns

Available in two Lengths

Allows a 12 Gauge Shotgun to use 450 Bushmaster Ammunition



450 Bushmaster Shotgun Adapters

Allows a 12 gauge Break Action Shotgun to use 450 Bushmaster Ammo.

450 Bushmaster Shotgun Adapters Compatible with 12 gauge Break Action single as well as double barrel shotgun. 
Alloy Steel construction coupled with multiple O-ring configurations. As a result easily achieve a good fit for 12 ga. shotguns.
Rifled dimensions are .445″/.450″ with 6 lands and .141″ wide.
Rifled with a 1:18 twist rate.
Black Oxide Coated  * Provides notably better corrosion protection (for maximum corrosion protection keep a thin coat of oil on the insert)
I recommend keeping a coat of oil on the insert for more corrosion protection.
Made in U.S.A.
Please Note:  Not all shotguns are the same!  While most shotgun are capable of handling high pressure rounds such as the. On the other hand some are not.   Therefore only use these rounds in shotguns that are capable.  For example, a shotgun with a SB1 or Sb2 reciever.  I recommend on any shotgun to test the first shot in a vice while out of harms way in addition  always wear eye and ear protection.  After that if you see that the primer punctured in the round discontinue using this round and use the less powerful round. Such as a 38 Special instead of the 357 Mag These high pressure rounds include: 45-70, 450 Bushmaster, 357 Mag, 327 Shotgun Adapters , 44 Mag, and 22 Hornet.  Please always be safe and aware.
Thank you for reading.


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.

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.

If you like our 450 Bushmaster Shotgun Adapters , check out our other Shotgun Adapters

Checkout : Your business and support are greatly appreciated. You are certainly welcome back, and your suggestions are valued. In other words, we are happy to hear from you.

*All items shipped USPS with tracking.  After that items are shipped within one day of receiving order. Therefore resulting in an average delivery time is 3-5 days after processing.

You may return any item for any reason full refund.

Mail returns to:


Central Tooling Inc.

90 County Farm Rd.

Toccoa, GA, 30577

United States

Check out : In conclusion,  Thank you for Shopping with us! Check back often for Shotgun AdaptersBarrel LinersHeavy Barrel BlanksSpy BoltsReplacement Parts.  In addition to our newly added Threaded Barrel Blanks.  Thanks again for shopping with us.


Additional information

Weight N/A
Dimensions N/A

18, 24

7 reviews for 450 Bushmaster Shotgun Adapter

  1. Esequiel Zeke (verified owner)

    Chaszel is the best , great customer service, fast shipping and awesome quality on all their products. Chad is a great man and very understanding. I highly recommend him for all of your adapters or firearm needs⭐️⭐️⭐️⭐️⭐️.

  2. Theron Mires (verified owner)

  3. Karl Bartlow (verified owner)

  4. Peter n. (verified owner)

    Excellent adapter better than the other ones out there excellent customer service

  5. Edmundo (verified owner)

  6. robert rogers (verified owner)



    Reasonable Pricing.
    Fast shipping.

    EXCELLENT Accuracy, Fit and Function.

    I experience as good or better accuracy with the 450 Bushmaster adapter insert in my Breakover 12 gauge as I get with my dedicated bolt rifle and AR platform.

    Great Product! Thanks
    Robert in Brownstown Il.

  7. robert rogers (verified owner)

    I have so many Chazel adapters and this is common.
    I get BETTER accuracy from this BARREL/liner than Zi can get frim my 2 AR platforms and my bolt action 45O Bushmaster! GO FIGURE? Will leave it at that before I sound too excited. Thanks as alwsys

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