Frag Out! Magazine
Issue link: https://fragout.uberflip.com/i/1407425
with COTS devices such as B&T muzzle brake seen on the 10.5 barrel of 5.56 GROT pictured. Gas blocks are slightly dif- ferent due the other thick- ness of barrels and other attachment methods. Both gas regulators and pistons are interchangeable between the rifles, except the different diameter of holes in the regu- lator. Due to the completely different length of barrels and the energy required to oper- ate the piston rods are non interchangeable. Barrels attach to the receiv- er with turnbuckle – dimen- sions are different and torque required to attach the barrels is different too (19-21 Nm in .223 and 21-23 Nm In .308). Upper receivers share the same shape but 7.62 one is definitely larger and thicker (42 mm in rifle and 38 mm in assault rifle). The bolt carri- ers are different (7.62 is en- larged) but charging handles are the same in both guns. Other internal parts such as recoil spring, recoil rod and recoil pads were enlarged too, due the different weight, forc- es and energy of .308 rounds. Because of the enlarged bolt carrier, the firing pin in GROT 762N was lengthened. The bolt slider is also larger even though the bolt does not look so (it was redesigned as the size of the round is differ- BIG muzzle device cartridge chamber castle chamber barrel cast gas node FIREARMS