Core15 Hardcore System X3
5.56 NATO or 6.5 Grendel (new 2016) cal., GIO, 18 or 20 (new 2016, 6.5 Grendel only) in. fluted black Nitride finished or bead blasted stainless steel (new 2016, 20 in. bbl. only) barrel, Magpul Gen M3 20 or 30 shot PMAG or 25 shot ASC 6.5 ...