The SB Tactical FS1913 Pistol Stabilizing Brace is 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. FeaturesAdvanced steel hinge design locks folded and extended positionsPull-through design offering quick deploymentIncludes complete assembly and adjustable nylon strapOffered with a light-weight polymer (FS1913) or 6061 aluminum (FS1913A) strut