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.
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