Caliber: 223/5.56, 223 Wylde, 6 ARC, 338 ARC. Barrels: 13.5”, 14.5” (pinned and welded), 16”, 18”, 20”. Combines A-DAC (Ambidextrous Dual Action Catch) system from Radian Weapons with JP Ambi Mag Release. Compatible with any mil-spec-pattern upper receiver. Choice of JP Low Mass Operating System, JP Full Mass Operating System, or JP Variable Mass Operating System. Trigger: JP Fire Control Package, 3.0 to 5.0 lbs. Ambi lower receiver introduced 2020. Various Cerakote options by piece from $60-$420.