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Sig Sauer 8901673: SIG Sauer factory PCB kit installs easily on SIG MPX or SIG MCX via the receivers 1913 interface. Comes with a forearm strap, providing a more stabile target shooting experience. Incorporates a locking hinge mechanism to securely fasten the brace against the pistol when not in use, and locked when folded out, preventing any swinging movements.