#html-body [data-pb-style=C9MMR9G]{justify-content:flex-start;display:flex;flex-direction:column;background-position:left top;background-size:cover;background-repeat:no-repeat;background-attachment:scroll;border-style:none;border-width:1px;border-radius:0;margin:0 0 10px;padding:10px}#html-body [data-pb-style=IIC5PTM]{border-style:none;border-width:1px;border-radius:0;margin:0;padding:0}Barrel: 16" 4150V Chrome Moly Vanadium steel barrel, chambered in 5.56 NATO, with a 1:7 twist, M4 barrel extension, and a Mid-length gas system. The barrel is finished with a .750" diameter low-profile gas block, PSA 13.5" Lightweight M-Lok Free Float Rail and an A2 flash hider. Upper: Forged 7075-T6 A3 AR upper is hard coat anodized black for durability. Featuring M4 feed ramp cuts, these upper receivers are made for us right here in the USA. Bolt Carrier Group: For AR15 and M16 rifles and carbines. Bolt is made of shot-peened, Mil-spec Carpenter 158A(R) steel. Gas key is secured with grade 8 fasteners and staked. Includes Charging Handle. Lower Build Kit: PSA MOE 2-Stage Lower Build Kit, Black 2-Stage Nickel Boron Trigger Assembly: Platform: AR-15/AR-10Finish: Nickel BoronType: 2-StageFirst Stage Weight: 2.0lbsSecond Stage Weight: 2.5lbsTotal Pull Weight: 4.5lbsAdjustable: NoTrigger Type: M4 Curved Includes: Magpul MBUS Sight Set, Black