"The Diamondback Firearms DB15BG Black Gold AR-15 Semi-Auto Rifle is a direct-impingement AR with upgraded components and signature Diamondback quality. The DB15BG features a 4150 CrMov barrel with a mid-length gas system which helps reduce recoil by slowing down the direct impingement gas system. The receiver group is made up of 7075 T-6 aluminum. The 15"" Diamondback handguard features M-LOK slots to mount any accessories you need. This DB15 also includes a Magpul CTR collapsible, lockable stock and a Magpul K grip. The trigger is standard mil-spec style. 16"" 4150 CrMov barrel Mid-length DI gas system 7075 T-6 aluminum receiver group 15"" M-LOK handguard Magpul CTR stock Magpul K grip Mil-spec style trigger"