Magpul PRS Precision-Adjustable Stock AR15/M16 (5.56×45) Model, Foliage. The Magpul PRS (Precision Rifle/Sniper) AR15/M16 Model is a drop-in, precision-adjustable butt stock for rifles with A1/A2 fixed stocks, A2 spacer not required for PRS stock. Designed to offer the fine-tuned, customized feel of a precision target stock, the PRS is adjustable for both comb height and length-of-pull without sacrificing the durability necessary to withstand the operational environment. Compared to the A2 stock, the PRS can shorten LOP by .25" or extend it by .75" as well as provide three-quarters of an inch of comb height adjustment. Machined aluminum adjustment knobs feature positive-locking click detents to maintain position under recoil and allows easy, tool-less adjustments by simply rotating the knobs. Aluminum butt-plate and alloy steel adjustment shafts provide stability and strength to withstand severe impact conditions. Rubber butt-pad offers positive shoulder purchase to prevent slippage. Bottom Picatinny-type rail allows for monopod use, additional sling mounts or storage. Stock includes all mounting hardware for A1/A2 type rifles with fixed stock.