With all the features of the Mk-20 Sniper Support Rifle, the SCAR 20S is a rock-solid, gas-piston operated .308 precision rifle. Its match-grade, two-stage Geissele trigger breaks crisply at 3.5-4.5 pounds, full-length MIL-STD 1913 rail at 12 o’clock position, and fixed buttstock provides adaptability to fit to each user’s needs through adjustable length of pull and cheek rest height.