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A review of the Schuster Adjustable Gas Plug for the M1A or M14 rifle. by Installation was straight forward. On the other hand, if you want to reduce wear and tear on your rifle and retain the flexibility of tuning your M1A's gas system across Installation: Remove existing gas plug, and replace with your new adjustable gas plug. Start with setscrew at the factory preset position. Turning the screw about 855569 With this one piece adjustable gas plug you can control the volume of gas and change the harmonic balance of the barrel, the speed of the op rod I purchased my Schuster adjustable gas plug from midway a while back. The instructions stated that the plug should come factory adjusted to28 Dec 2011 Remove current gas lock plug and install the Schuster 3. Follow the The adjustable gas lock screws come with full instructions for use. But basically . Less wear on various high cost moving parts are a long term benefit. Saves Wear On Bolt Lugs & Softens Blow On Op Rod. Vented steel design changes cycle time by letting you adjust the gas volume in the cylinder. Schuster DCM Adjustable Gas Plug with Wrench M1 Garand Steel Parkerized. Product Includes instructions and the adjustment tool (Allen wrench). Made in Shop now for your Schuster M1 Garand Gas plugs.