The Diamondback is a carbine rifle that features an A3 flattop forged 7075 T-6 aluminum receiver with a black anodized hardcoat finish; 12" aluminum M-LOK rail; black nitride Chrome-Moly, free float, medium barrel and an Azimuth 5.56 sporter model bolt carrier group. Includes a 10rd Magpul magazine. Oal 32"- 36" Hand Right Twist 1:8" Action semi-auto Muzzle A2 Flash Hider Safety Manual Thumb Series *CO Compliant Sights Optic Ready Caliber 5.56x45mm NATO Capacity 10+1 Barrel Length 16" Receiver Material 7075-T6 Aluminum Stock Description Magpul Carbine Barrel Description Black Magpul Metal Finish Group Blued/Black Stock Finish Group Black Barrel Length Range 16" to 16.99"