<p>Lower receiver: billet 7075-T6 aluminum. Front magazine well finger grips, NiB-X Nickel Boron coated for durability. Upper receiver: billet 7075-T6 aluminum NiB-X coated for lubricity and durability. Barrel: match grade chrome moly vanadium steel, 1:10 Twist, 18 inch light profile, carbine gas system, Nitromet QPQ Salt Bath Nitride in the bore for extended life and accuracy, NiB-X coated on the outside for durability and heat dissipation. Barrel extension: DPMS NiB-X coated barrel extension for extremely smooth locking and unlocking with the bolt. Gas system: low profile gas block, CNC machined from 4140 Steel and NiB-X finished, Nitromet QPQ carbine length gas tube, direct impingement. Bolt carrier group: DPMS profile, MP tested, NiB-X coated, properly staked gas key. Hammer, trigger and disconnect coated in NiB-X for lower pull force (6 pound) and smooth reset. Carbine buffer. Sights, optics ready receiver. Six position buffer tube Mil-spec 7075-T6 aluminum, NiB-X coated inside and out. Made in the USA.</p>