This review details a 500-round test of the Palmetto State Armory Saber in .300 Blackout, focusing on reliability with 220-grain subsonic ammunition. The testing highlights the critical role of the adjustable gas block, which consistently required setting 12 (wide open) for proper cycling and bolt lock-back, both suppressed and unsuppressed. The reviewer also notes potential heat-related adjustment issues and offers a tip for ensuring full engagement of the adjustment mechanism.
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