A tactical workhorse, the AR-10 B-Series Tactical 16? Complete Upper is the perfect tool for duty and defense. The dual purpose, flash hiding compensator tames recoil while reducing signature. A sturdy 15-in. Key-Mod handguard provides ample space and a full length MIL-STD 1913 12 O’Clock rail for sights and accessories. An adjustable gas block also allows the upper to be individually set for optimal performance using a wide variety of ammunition. AR-10 B-Series Tactical 16? Complete Upper Components & SpecificationsBarrel: 16" HB, Double Lapped, Chrome Lined / Chrome MolyBarrel Twist Rate: 1:11.25RHMuzzle Device: Flash Hiding CompensatorAttachment Points: KeymodUpper Receiver: Forged, Flat-Top with MIL-STD 1913 Rail, 7075-T6 Aluminum, Hardcoat Anodized Weight: 5.8 lbs. Length: 28"Compatible with Armalite AR-10 A-Series lowers. Armalite AR 10 Tactical Upper Assy 16" bbl