Armalite AR-10 Defensive Sporting Rifle .308/7.62x51mm 16 Inch Threaded Barrel 5/8x24 TPI Black 10 Round California Compliant

Barrel is double lapped and chrome lined/chrome moly for enhanced corrosion resistance and extended life. Threaded 5/8x24 TPI. 1:11.25 inch right hand twist (150-175 grain ammo with 168 grain being ideal). Flash suppressor. Single stage trigger. MIL-STD 1913 rail gas block.Top of gas block is .398 (+/- .010) lower than top of receiver. 7075-T6 aluminum forged flattop upper with MIL-STD 1913 rail. Anodized aluminum finish on upper and lower receiver. Comes with one Magpul PMag.