PSA 7.5" Pistol-length 300AAC Blackout 1/8 Phosphate 7" M-LOK Shockwave MOE Pistol Kit - 5165447566

Barrel:  7.5" 4150V Chrome Moly vanadium steel barrel chambered in 300AAC Blackout with a 1 in 8" twist. Pistol-length gas barrel is finished off with a PSA 7" M-Lok Rail, a low profile gas block and an A2 Flash hider. 
Upper: Forged 7075-T6 A3 AR upper is made to MIL-SPECS and hard coat anodized black for durability.  These uppers are made for us right here in the USA by a mil-spec manufacturer.
Bolt: Full-auto profile bolt carrier group. Milspec Carpenter No. 158® steel bolt, Shot Peened, High pressure tested, Mag particle inspected, Gas Key Hardened to USGI Specifications, Fastened with Grade 8 screws, and Staked Per Mil-Spec. 8620 steel M-16 profile carrier is chrome lined and phosphate coated.
Pistol Build Kit:  A high quality lower build kit with everything you need to assemble your AR-15 lower into a pistol. Features polished hammer and trigger contact points, and black oxide coated hammer and trigger springs. Also includes Shockwave Blade pistol stabilizer, Shockwave tube, castle nut, mil-spec endplate, carbine buffer spring, standard carbine buffer.