Diamondback DB175AK621 DB15 5.56x45mm NATO 30+1 16″, Multicam Rec/15″ Slim M-Lok V-Rail Handguard, OEM Black Gold Lower, Black Furniture, Magpul CTR Stock & K2 Grip, DBSB-IV Flash Hider

Diamondback DB0700P701 SDR 9mm Luger 6 Shot 3″ Polished Stainless Steel Barrel, Cylinder & Frame, Black Hogue Rubber Grip, Exposed Hammer

Ruger 90739 Threaded Barrel Kit 5.7x28mm Fits Ruger 57 4.49″ Black Nitride Stainless Steel Threaded Barrel

HK MR556 A4 5.56 16.5 TB 1 30RD