Calibers: 5.56 NATO/223 Rem., 223 Wylde, 6mm ARC, 6.5 Grendel, 338 ARC. Barrels: 13.5”, 14.5” (pinned and welded), 16”, 18”, 20”. Buttstock: Synthetic modified thumbhole or laminate thumbhole. Grip: Hogue Pistol grip. Basic AR-type general-purpose rifle with numerous online-ordering options.