Troy Industries Q.D. 360 Push Button Swivel Rail Mount The Troy QD 360 Push Button Swivel Rail Mount is a low profile, solid, quick detach sling attachment. This sling mounting solution includes a 360-degree push button, 1.25" QD swivel. It mounts securely to any 1913 Picatinny rail using a flathead screwdriver. Constructed of aircraft grade aluminum and anodized matte black.