20ga to 357 Magnum /38 Special Shotgun Adapter - Chamber Reducer 6" Long

20ga to 357 Magnum /38 Special Shotgun Adapters

357 Shotgun Adapters Allow a 20 Gauge Break Action Shotgun to use 357 Magnum or 38 Special 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.

Finger Grooves for easy extraction of spent casings.

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

Rifle dimensions are .355″/.349″ with 6 lands and .125″ wide. with a 1:12 twist rate.

1-14 twist rate.

*Should only be used in capable shotguns with SB1 or SB2 or equivalent receivers.