"The Diamondback DB9R Semi-Auto Pistol-Caliber Carbine is a blowback-operated carbine that accepts standard GLOCK double-stack 9mm magazines. The blowback action is simple and reliable, utilizing the energy from the fired round to cycle the action with no extra weight from a gas system. It runs cleaner and can cycle low-power rounds easily, making it incredibly versatile. The upper and lower receiver are made from 7075-T6 forged aluminum and are nearly identical to the standard AR receiver set, except that the lower is designed to accept GLOCK mags. That makes stocking up on extra mags simple and affordable. The 16"" 4150 CrMov barrel features a black nitride finish and features an A2-style .30 caliber flash hider. The Magpul MOE stock provides simple length-of-pull adjustments and a solid feel on the shoulder. The mil-spec trigger breaks at about 5 lbs. M-LOK handguard. Magpul MOE grip. Simple, robust blowback action Lower receiver accepts GLOCK double-stack 9mm magazines 7075-T6 forged aluminum upper and lower receiver 16"" 4150 CrMov barrel with black nitride finish Magpul MOE adjustable stock Magpul MOE grip M-LOK handguard 5-lb. mil-spec trigger"