20ga to 380 text

380 Auto 20 Gauge Shotgun Adapters

(9 customer reviews)


380 Auto Shotgun Adapters for 20 Gauge Shotguns

Adapters come in 4 Lengths

2 3/4″, 5, 11″ and 18″

All Adapters are Fully Rifled with a 1-12 or 1-18 Twist Rate.

Select Length and Chamber below: 
SKU: N/A Categories: , , Tags: , , ,


380 Auto Shotgun Adapters for 20 Gauge Shotguns

380 Auto Shotgun Adapters Allow a 20 Gauge Break Action Shotgun in return to use 380 Auto (ACP) 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 it is easy to achieve a good fit for 20 gauge Shotguns.

Rifled dimensions are .355″/.349″ with 6 lands and .125″ wide.

Black Oxide coating provides notably better corrosion protection (for maximum corrosion protection keep a thin coat of oil on the insert)

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
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"

9 reviews for 380 Auto 20 Gauge Shotgun Adapters

  1. Troy Bartlett (verified owner)

    Looks awesome as always!

  2. William Baeza (verified owner)

  3. Peter Johnstone

    2nd Review; I previously reviewed, above. I bought a second one to rechamber – done by me, at my own risk, not something Chaszel promotes! I had a bunch of 9mm Largo and 38 Super brass left over from selling-off all the guns that used that brass. So, I rechambered the 380 to 38 Super. It has worked great – shoots great – 1”-2” at 50 yards all day long. I use a 20ga CVA Hunter rifled slug gun. The rifling in the bore and using all three ‘O’ rings really stabilized the adapter and really enhances consistency for the point of impact. Just FYI.

  4. Robert M. (verified owner)

  5. Peter Johnstone

    Bought one. Very well made. Shoots great👏👍

  6. Wayne Johansen (verified owner)

    Great company

  7. paul r. (verified owner)

    I haven’t had a chance to shoot it yet, the adapter fit well in my savage 24c 20 gauge barrel and the 380 cartage fit easily in the chamber . I was pleased with the quick turn around of my order during holiday shopping season .

  8. 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…..!!!!

  9. Cleaver (verified owner)

    Great product. Totally functional and does exactly what I needed it to do.

Add a review

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