Description
MK12 MOD 0 SPR Collar
This shorter collar was designed for use on MK12 Mod 0 rifles.
MK12 MOD 1 SPR Collar
This longer 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.
