BlackJack Buffers (SKS) Blue
Fits SKS -all types
Eliminates bolt carrier to receiver cover contact
Protects the receiver from the impact of the bolt carrier.
Great for scopes.
Mounts in actual receiver and not the cover.
Blue is harder and holds up better under full-auto and bump firing -Green is softer and absorbs more impact shock.
Estimated life is 5,000 rounds.