HOW IT WORKS

The roller-lock system isn’t really, a locked-breech design. If we want to be pedantic (and you should be, every now and then, just to keep in practice), it is a roller-delayed blowback design. When the bolt crashes home, the bolt head holds the round in place, and the extractor latches onto the case rim. The rear portion of the bolt assembly, by way of the cocking piece, cams the rollers into recesses in the barrel extension. When fired, the case thrust from the chamber pressure is borne by the rollers. The load forces the rollers to cam out of those recesses. The rate at which they cam out is controlled by the angle of the shoulders of the cocking piece. Once the rollers have been cammed clear, the remaining case…

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Firearms News (Digital) - 1 Issue, Volume 75, Issue 9

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