Magpul PRS stock is intended for semi-automatic sniper or varmint type rifles. It mounts to rifle-length, mil-spec carbines, or A5-length receiver extension tubes (not included). The enhanced strength butt-plate withstands severe impact & recoil up to .50 BMG. The rubber butt-pad provides positive shoulder purchase to prevent slippage & is adjustable for both cant & height. It also features machined aluminum LOP & cheek piece adjustment knobs w/positive locking click detents, Steel adjustment shafts finished w/Melonite for wear & corrosion resistance, All aluminum components finished with MIL-A-8625F, Type III, Class 2 hard anodizing, Bottom M-LOK slots provide additional sling mounting possibilities or for attaching 1913 Picatinny rails for use w/monopod, Front/rear - rotation-limited QD sling swivel mounts (swivels not included), and Rear - 1.25" aluminum sling loop (left-right reversible).