PSA 7.5" 5.56 NATO 1/7 Phosphate 6" Lightweight M-Lok Upper w/Romeo MSR, BCG, & CH

Barrel: 7.5" 4150V Chrome Moly Vanadium steel, phosphate coated and chambered in 5.56 NATO with a 1 in 7" twist. Pistol-length gas barrel is finished off with a PSA 6" Lightweight 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. Featuring a mil-spec finish, these uppers are made for us right here in the USA by a mil-spec manufacturer.Bolt: Bolt is made of Mil-spec shot-peened Carpenter 158 steel. Gas key is secured with grade 8 fasteners and staked per mil-spec. Sig Sauer Romeo MSR Red Dot Sight:The ROMEO-MSR is a sealed compact red dot or green dot sight intended for MSR, carbine, shotgun, and air rifle. Brightness is adjusted with a top-mounted rotary dial, featuring 10 daytime and 2-night vision settings for quick target engagement in any condition.Features:Dependable IPX-7 waterproof and fog-proof performanceOver 20,000 hours runtime on a CR1632 batteryTop loading battery compartment with integral brightness control featuring 10 daytime and 2 NV settingsUltra-compact size and weight with unlimited eye-relief and parallax-free operationAircraft-grade aluminum housing and mountSlipover, see-through flip-backs