Here, we revisit the PTR-91 and a similar rifle, the Century Arms C91 Sporter, both chambered in 308 Win./7.62 NATO. We also gave Buy recommendations to the Vector Arms V-53 in 5.56 NATO and the Bobcat Weapons BW-5 9mm in that same article. We mostly praised the PTR-91 rifle in the January 2005 issue, save it needing a trigger job and a flash hider. We have previously tested three roller-locked rifles made in the U.S., including the 308 Win. The bolt then returns to battery, stripping a cartridge from the magazine along the way. On firing, force on the bolt keeps the action locked until the bullet exits the barrel, then the action unlocks and the bolt is jolted to the rear against spring pressure. These rollers, located on the bolt on each side, lock into detents in the trunnion of a stamped steel receiver. The rifle employs a delayed blowback system with a nonrotating head and twin rollers. The roller-locked CETME Model 58 was the basis for Heckler & Koch’s G3-based rifles, followed some time later by a semiautomatic version labeled the HK-91, which isn’t gas- or recoil-operated in the conventional sense.
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