The heavy barrel version of the FNAR is also chambered in 7.62x51mm NATO (308 Winchester) and features an ambidextrous magazine release and 20" cold hammer-forged MIL-SPEC fluted barrel with hard-chromed bore and target crown. A one-piece, receiver-mounted MIL-STD 1913 optical rail comes standard, along with a trio of similar accessory rails attached to the adjustable synthetic stock s fore-end for mounting a battery of tactical lights and lasers. Models with 10- or 20-round detachable steel box magazines (DBM) are available.