12ga to 10mm Shotgun Adapter - Chamber Reducer 6" Long

12ga to 10mm Shotgun Adapters

10mm Shotgun Adapters Allow a 12 Gauge Break Action Shotgun to use 10mm 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 12 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 .390″/.400″ with 6 grooves and .120″ wide with a 1:14 twist rate.

1-14 twist rate.

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