Palmetto State Armory is proud to offer the new PSA Carbine-Length Quad Rail. This rail is a drop in upgrade for carbine length gas systems with a delta ring and round handguard end cap. Features include (2) QD sling swivel sockets on the left and right side and laser engraved rail slot markings. The handguard comes with (3) 8-rib and (1) 5-rib picatinny rail panels, as well as a vertical foregrip. This handguard is hard coat anodized for corrosion resistance and is made in America and backed by Palmetto State Armory's Lifetime Warranty.