Featuring .223 Wylde chamber, a hybrid chamber designed to better accept both 5.56 NATO and .223 Rem. ammo. Forged upper and lower receivers, 18" fluted stainless barrel with Rock River Beast or Hunter muzzle brake and low-profile gas block are other features. Buttstock is RRA A2 or CAR, with Hogue Rubber pistol-grip and RRA's TRO-XL extended-length free-float rail handguard. The X-1 Rifle is available in other variations and chamberings, including 6.5 SPCII, .458 Socom and 7.62 NATO.