A low-profile, left side-folding, strut design compatible with all platforms utilizing an M1913 interface at the rear of the receiver. The FS1913 is a complete assembly offering pull-through opening and a solid lock-up when extended. Features- advanced steel hinge design locks in both folded and extended positions, pull-through design offering quick deployment. ATF compliant, US veteran designed and proudly made in the USA. Includes- complete assembly and adjustable nylon strap.