Maxim Defense Industries MDX 505 PDX/SCW Compatible URG Upper Receiver, 5.56 NATO, Hate Brake, 1/2-28 Thread, 5.5in Barrel, Arid Earth, MXM-47834

R.G is built to handle the fierce demands of the Tier 1 community and designed to install on any Mil-Spec lower receiver. With the PDX U.R.G you dominate close quarter encounters and achieve maximum energy on target without sacrificing accuracy at distance. At just 14 in overall length and a 5.