BF15 M4 TIER 1
5.56 NATO cal., AR-15 style, GIO, 16 1/2 in. M4 barrel with A2 birdcage flash suppressor, F-Marked A2 front sight post gas block, 30 shot mag., aluminum flat-top A3 upper receiver w/Picatinny rail, Magpul MBUS Gen2 or A.R.M.S. rear flip-up ...