The DPMS DP51655131214 is an AR-15 complete upper with a 16" quad-rail layout, chambered in 5.56 NATO. Its 16" barrel is 4150V chrome-moly vanadium steel with a 1:7 twist and an M4 barrel extension, and the nitride treatment adds durability and accuracy. The barrel carries a carbine-length gas system under a low-profile gas block, and an A2 flash hider caps the muzzle.

The free-float 13" Panther quad rail gives you mounting room for accessories on all four sides, and its proprietary markings appear only on this line of DPMS uppers. The receiver is a forged 7075-T6 aluminum A3 upper with M4 feed ramp cuts, hardcoat anodized black for durability. It comes with a bolt carrier group built around a Carpenter 158 bolt, plus a charging handle, forward assist and dust cover, so you don't have to source those parts separately. DPMS assembles each upper to order and test fires it.

• Brand: DPMS
• Model: DP51655131214
• Caliber: 5.56 NATO
• Barrel Length: 16" (1:7 twist, 4150V chrome-moly vanadium steel, nitride)
• Handguard: 13" Panther quad rail
• Upper Receiver: Forged 7075-T6 aluminum, hardcoat anodized black
• Muzzle Device: A2 flash hider
• Included: Bolt carrier group and charging handle