Uncle Mike's MO10013 Swivels, QD 115 Blued 1 4" Machine Screw The Uncle Mike's machine screw type swivels designed to replaces many factory non-detachable swivels QD 115 swivels from Uncle Mike's have machine screw fore end base and wood screw rear base These um swivels are mounted on pistols, rifles, Shotguns and muzzleloaders Machine screw fore-end base, wood screw rear base Replaces many factory non-detachable swivels Swivel Lock spring-loaded plunger and a knurled, threaded sleeve eliminates accidental opening of the swivel