Maxim Defense Industries MDX 505 PDX/SCW Compatible URG Upper Receiver, 300 BLK NATO, Hate Brake, 5/8-24 Thread, 5.5in Barrel, Arid Earth, MXM-47836

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.