Quick view Ruger Ruger Ar-556, Rug 8514 Ar556 Mpr 5.56 NATO 18 Coll Blk Syn 30r $1,044.40 $820.60 Ruger's ar-556 mpr is made from 7075-t6 hard-coat anodized aluminum forgings, shot-peened and proof-tested 9310 steel bolt, and 8620 steel bolt carrier.It features a lower receiver that is fitted with magpul moe grip and moe sl collapsible buttstock on a... Compare Add to Cart