|SCAR 16S is chambered in 5.56x45mm NATO (223 Rem.) cartridge. Innovative gas-operated, short stroke piston system reduces fouling for greater reliability. SCAR features user-interchangeable, free floating, cold hammer-forged MIL-SPEC barrel with hard-chromed bored. Fully ambidextrous operating controls. Receiver-integrated MIL-STD 1913 optical rail plus three accessory rails enable mounting of a variety of tactical lights and lasers. Telescoping side-folding polymer stock is fully adjustable for comb height and length of pull.