SHARK COAST TACTICAL Humboldt 10″ 300 Black Out AR15 PISTOL BUILD. Custom build we threw together using the Humboldt Billet Upper billet set. Forged milspec 7075-T6 A3 AR upper with milspec ntride bolt carrier. Milspec LPK with stainless steel trigger. M-lok Rail, a low profile gas block. 10” milspec barrel 4150V Chrome Moly vanadium steel, phosphate coated, and chambered in 300 Blackout with a 1 in 10″. M-lok Rail and low-profile gas block. Build comes with Fab Defense flip up sights, 30rd Boogloo magazine, Streamlight TLR mounted 1000 lumen weapon light and pressure switch, Moe grip, SB3 brace, Holosun HE403B Green dot and carry case.