20ga to 45acp ID

20 Gauge to 45 Caliber Shotgun Adapters

(28 customer reviews)


45 Caliber 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 1-16 Twist.

Select Length and Chamber below: 


20 Gauge to 45 Caliber Shotgun Adapters

45 Cal Shotgun Adapters Allow a 20 gauge Break Action Shotgun to also use 45 Caliber Ammo.

Compatible with 20 gauge Break Action single as well as double barrel shotguns
Rifle dimensions are .451″/.445″ with 6 lands and .145″ wide. With a 1:12 & 1:16 twist rate.
Black Oxide coating provides notably better corrosion protection (for maximum corrosion protection keep a thin coat of oil on the insert)
Comes with multiple O-rings.  As a result,  easily achieving a good fit for 20 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. 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. Thank you for your interest.

If you like our 45 Cal Shotgun Adapters, check out our other Shotgun Adapters

Additional information

Weight N/A
Dimensions N/A

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


LC, LC/.410, ACP


Black Oxide

28 reviews for 20 Gauge to 45 Caliber Shotgun Adapters

  1. Richard Mastenik (verified owner)

    I have purchased 4 items from Chaszel over the past two years: two .45/70 adapters at 18″ long for my double barrel 12 gauge, and one each .357 to 20 gauge and .45 Colt to 20 gauge – both also at 18″. I now have a double .45/70 bear gun for my western off road adventures, and excellent pistol caliber options for my SHTF prepper kit – with both the .357 and .45 Colt having enough bite for everything but Grizzlies – and after 35 years in rural Alaska I simply no longer recreate in Grizzly/Brown Bear country. I am on Chad’s back order list for one of his .30/30 to 20 gauge adapters and when it arrives my immediate needs will be satisfied. I am extraordinarily pleased with the quality and practical function of Chaszel adapters and even more impressed with their comittment to a level of quality service beyond compare. I could not be more pleased with my experience with Chaszel’s operation. Thank you Chad.

  2. David Hillberry (verified owner)

    Ships quickly, very well packaged and the correspondence was very good.. the product is very nice and a thing of beauty, I will be ordering from these folks again without hesitation

  3. bbgun

    Got the 12 gauge to 45 Long Colt. Great craftsmanship and fast shipping. Planning on working up Colt/TC loads in my H&R SB2 Shotgun.

  4. Charles Luther (verified owner)

  5. jay wysong (verified owner)

    Great product

  6. william forder (verified owner)

  7. MIchael S. (verified owner)

    Really well made adapter,accurate enough to hunt with.I will definitely buy from Chaszel again.

  8. Anonymous (verified owner)

    Very well machined, nice nitride finish and shipped with additional “O” rings. Also, the adapter was marked with caliber in the side…nice touch. I would highly recommend Chaszel barrel adapters.

  9. Richard O. (verified owner)

    Item was ordered late in the afternoon and shipped next day.6″ adapter was beautiful fit and finish,shows pride in their work.Weather here has been terrible,but did fire 10 rounds.Groups showed great potential and no sign of keyholing.Hope to purchase 20ga to .22lr, which oddly enough isn’t listed on website.

  10. Lewis Mitchell (verified owner)

    Looks good, the service was prompt. I haven’t had the opportunity to shoot it yet. I’ll follow up once I get to the range. Hope to add a 7.62×39 for my 20 guage soon.

  11. Stephen (verified owner)

    Great piece, fit and works, accuracy better than expected

  12. Carl (verified owner)

    great again! I have adapters for both 12 and 20 gauge shotguns and they work perfectly

  13. Anonymous (verified owner)

    Good products quick delivery, accurate enough up to 25to50yrds and maybe beyond.

  14. Curtis Stone (verified owner)

  15. Travis (verified owner)

    Great product. Waiting for other calibers to come available now.

  16. Ryan (verified owner)

    Great quality and quick turn around

  17. Ruben (verified owner)

    Great quality and works perfectly

  18. Bruce G. (verified owner)

    Wanted a 45 long colt, I got a 45 acp-it works good but does not have the same punch as the long colt I wanted.The service was great it got here in a couple of days, this is the 2nd one I got and it also works great-its in 44 special-excellent item.

  19. Frederick G. (verified owner)

    Looking for 30-30 and 7.62 to 20ga to come out every day!! Dont want to miss them. These adapters are awesome in every way.

  20. glenas mckiddy (verified owner)

    excellent workmanship

  21. Wendal North (verified owner)

    Recieved insert quickly. Excellent quality. First time to range shot a 1 1/2” group at 50 yards with a 255 grain cast load. Looking forward to working up a load for the insert. If you use more than one o-ring lube the shotgun barrel, makes it easier to insert and remove.

  22. glenas mckiddy (verified owner)

  23. Anonymous (verified owner)

    top notch quality and craftmanship consistent with every item from chaszel! well worth the wait!

  24. Cleaver (verified owner)

    Great product as usual. I have 6 inserts total and each one works great. My latest, a 45acp, fits well and has great accuracy. I believe, within reason, Ican do anything with these inserts that I can do with a rifle

  25. Charles Sutton (verified owner)

    The adapters worked as advertised and are quite accurate. The support and after sale follow up are great.
    This is a good company to do business with.

  26. Jessica G. (verified owner)

    Excellent workmanship! Surprisingly accurate! Great products.

  27. Johnny Ryals

    The adapter works. It is reasonably accurate. A 45 piston round is not loud and the extra barrel length of the 20 gauge quieten the sound even more.

  28. Marvin Schmid (verified owner)

Add a review

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