The Garand Gear M1 Gas Plug, a non-adjustable alternative to the Schuster plug, was tested for its effectiveness in reducing operating rod velocity with commercial .30-06 ammunition. While it offered a minor reduction with M2 Ball, it actually increased op-rod speed with high-velocity and heavy commercial loads, failing to meet safe military specifications. The plug also suffers from poor tool fitment, making the Schuster adjustable plug a superior option for the same price.
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