So I tried taking out the gas cylinder plug from my M1A, wanted to check out the measurements of the piston, anyways, that thing is a bear to remove, didn't even budge it. the rifle was turning in my hand long before I could even turn the plug. 
Guess thats why they came up with Gas Cylinder Wrenches.
Dimitri
Guess thats why they came up with Gas Cylinder Wrenches.
Dimitri