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 5/8×24 barrel threading and a paddle magazine release – Specifications: – Caliber: .308 or 7.62 NATO – Action: Delayed Blowback Roller-Lock System – Overall length: 23 ½ “ – Weight: 7.8 lb – Barrel: 8 1/8 match grade bull barrel – Magazine: 20rd – Stock: machined butt cap