Chaszel 20 Gauge to 9mm Shotgun Adapter

9mm 20 gauge Shotgun Adapters

(4 customer reviews)


9mm 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.

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9mm Luger Shotgun AdaptersAll Products

9mm Luger Shotgun Adapters Allow a 20 Gauge Break Action Shotgun to use 9mm Auto / Luger 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,  easily achieving a good fit for 20 gauge shotguns.

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

9mm Luger Shotgun Adapters Rifle dimensions are .355″/.349″ with 6 lands and .125″ wide.


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.

If you like this product, check out our other Shotgun Adapters

Additional information


2 3/4", 5", 11", 18"


Black Oxide, No Finish (Silver)

4 reviews for 9mm 20 gauge Shotgun Adapters

  1. William Trader (verified owner)

    Verified reviewVerified review - view originalExternal link

    Very accurate out to 100 yrs.

  2. Paul R. (verified owner)

    Verified reviewVerified review - view originalExternal link

    I have the shortest 20ga-9mm and it actually shoots plenty accurately enough to secure game or in other scenarios.Great quality quick shipping and a company that stands behind their products made in USA what else could you want…

  3. Mark (verified owner)

    Verified reviewVerified review - view originalExternal link

    Great simple way to modify a firearm. Must have for a bugout scavenger gun.

  4. Bill Bieszk (verified owner)

    Verified reviewVerified review - view originalExternal link

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