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The reason you shouldn't use commercial ammo in a Garand is that the burn rate of the powder,and the resultant pressure curve,may be different than what the rifle was designed for.This can result in more gas coming through the gas cylinder than the design allows for,and can stress the action or even bend the operating rod.However,there is hope.You can install a Schuster or McCann adjustable gas plug,which vents the excess pressure (once adjusted) and allows the use of commercial ammo.Midway sells the Schuster plug for around $35.00,Fulton Armory has the McCann for around $40.00 .
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