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Motor Oil for M1A Piston?

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Old 11-14-2012, 11:27 PM   #11
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Do NOT lubricate the gas system piston, with anything. This mechanism is designed to operate DRY. If you put a lube, especially one with the consistency of motor oil, you will have a baked-on coating on the piston. I am not against motor oil for the other moving parts, such as the op rod and bolt. In fact, tests have shown Mobile One to be an excellent lube for the moving parts of many gas-operated firearms. It adheres to metal surfaces real well. But, the lubrication process does not include the gas system piston of an M1A. Leave it dry.

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Old 11-17-2012, 09:01 AM   #12
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If you burn motor oil on metal surfaces it leaves carbon deposits.
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Old 11-17-2012, 03:30 PM   #13
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Originally Posted by M14sRock
The piston should be left dry.
Exactly this!
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