OPS INC™ Mk12 Mod 1-B SPR Collar

This longer MOD 1 collar was designed for use on MK12 MOD 1 rifles. It has an internal step that interfaces with a step in MK12 barrels that prevents rearward movement. The set screw, typically positioned on the bottom prevents rotation.

The MOD 1-B collar is the same as the traditional MOD 1 Collar (A length), but the internal step is positioned to locate the taper forward at 2.05″ from the muzzle. This allows you to easily run B length cans  (AEM2, AEM3, AEM4, etc.) on traditional SPR cut barrels like the Douglas barrels. May not be compatible if you have a flip up sight. Not to be used with AEM5 family of suppressors.