Core15 Hardcore System X1
5.56 NATO or 6.5 Grendel (new 2016) cal., GIO, 16 or 18 (new 2016) in. fluted black Nitride finished or stainless steel (new 2016, 18 in. only) barrel, low profile gas block, Lantac Dragon muzzle brake (disc.) or CORE muzzle brake, Magpul G...