SB Tactical FS1913-01-SB Folding Assembly M1913 Picatinny is a low-profile, left-side folding assembly for platforms with an M1913 Picatinny interface at the rear of the receiver. Its strut design supports a compact profile for transport and storage.Complete assembly features a steel hinge that locks in folded and extended positions, plus a lightweight polymer strut. Confirm interface compatibility before installation; compatible examples include SIG MPX, SIG MCX, SIG Rattler, and Rock River LAR-PDS.Steel hinge locks folded and extended.Lightweight polymer strut.Fits rear M1913 Picatinny receiver interfaces.A technically focused folding solution for compatible platforms requiring compact storage and secure deployed positioning.