20ga 300 Blackout (Subsonic ONLY) Shotgun Adapters

(2 customer reviews)


These Shotgun Adapters allows a 20 Gauge Shotgun to use  300 Blackout Subsonic ONLY Ammo.


20ga 300 Blackout (Subsonic ONLY) Shotgun Adapters for 20 Gauge Shotguns

These Shotgun Adapters allows a 20 Gauge Shotgun to use  300 Blackout Subsonic ONLY Ammo.

For 3″ Or 2 3/4″ Chambers

18″ Long

Compatible with Break Action single or double barrel shotgun.

Rifled with a 1:12 twist rate.

Rifled Dimensions:  6 Groves Bore .300  / Grove .310

Black Oxide coating as a result provides notably better corrosion protection (for maximum corrosion protection keep a thin coat of oil on the insert)
20ga 300 Blackout Subsonic ONLY Shotgun Adapters Comes with multiple O-ring configurations.  As a result,  easily achieving a good fit for 20 gauge shotguns.
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 gov., 357 Mag, 327 Shotgun Adapters , 44 Mag, 30-30 Win 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.

If you like our 300 Blackout Subsonic ONLY Rifled Shotgun Adapters , check out our other Shotgun Adapters

Additional information

Weight N/A
Dimensions N/A

18", 24"

2 reviews for 20ga 300 Blackout (Subsonic ONLY) Shotgun Adapters

  1. alejandro vega (verified owner)

    Like them but I had to return them.

  2. jay wysong (verified owner)

    Great product.

Add a review

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