Comes with a flash hider H&K navy type polymer trigger group black tactical handguard machined butt cap welded scope rail As of 1/1/16 PDW R's will come with 5/8x24 barrel threading and a paddle magazine release - Specifications: - Caliber: .308 or 7.62 NATO - Action: Delayed Blowback Roller-Lock System - Overall length: 23 � � - Weight: 7.8 lb - Barrel: 8 1/8 match grade bull barrel - Magazine: 20rd - Stock: machined butt cap