Sylvan Arms Gen5 LH Folding Stock Adaptor SA5P-L AR-15 folding stock adaptor. 4140 steel construction in black finish. Weight 9.4 oz. Right or left fold versions. Adjustable hinge tension. Hardened buffer pin. 2 QD attachment points. Includes installation tools and a 1045 steel bolt extension. No additional parts are required for standard AR-15 bolt carrier groups. Installs in under 5 minutes. Compatible with AR-15 and AR-9 platforms.