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ESP-M Tactical Sling Swivel for GBB M4/M16 Replicas
A tactical sling
swivel made entirely from metal. Mountable on the rear part of the body of GBB
M4/M16 replicas with adjustable stock.
The swivel
enables free motion of the sling in a 180 degree radius, which means it can be
seamlessly used by both right-handed and left-handed users.