Features a chrome moly 16" lightweight barrel, with carbon fiber hand guard in several variants, 6-position tactical stock, low-profile gas block. In 5.56 NATO/.223. Weight 5.6 to 6 lbs. Introduced in 2015.

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.

Chambered for 7.62x39mm cartridge. This model has an 18" fluted barrel, muzzle brake, extended free-floating rail, Operator A2 or CAR stock, with Hogue pistol grip. Introduced in 2015.

Introduced 2019. Chambered in .450 Bushmaster, 16" stainless steel barrel, cryo treated, 1:24 twist. Forged RRA LAR-15M multi-caliber lower receiver and A4 upper receiver. 13" lightweight M-LOK free float rail.