BR4 SPARTAN
5.56 NATO, 6.8 SPC, 7.62x39mm, 7.62x6mm (mfg. 2014-2015), or .300 AAC Blackout (disc. 2017) cal., GIO, choice of 16 in. HBAR profile or SOCOM profile barrel with flash suppressor, gas block with A2 front sight tower, collapsible stock, forg...