O'Dell Engineering LMSR2 (LightWeight Modern Sporting Rifle) Intro M4 Carbine Semi-Auto Rifle - 5.56mm/223 Rem, 16", Melonited Barrel, 1:7", Low Profile Gas Block, Mil-Spec 7075 T6 Aluminum Upper Receiver, Type III Anodized, Carpenter 158 Bolt Carrier, 6
