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Old 05-28-2012, 06:11 PM   #1
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Default What is this noise?

I dont know how I noticed this but on my m1a when the bolt is held open I can hear something sliding slightly back and forth when I tilt the gun foward then backwards. Does anyone know what is moving back and forth. I dont notice it when the bolt is closed however.



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Old 05-28-2012, 06:39 PM   #2
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I believe that is the sound of your gas system working correctly. The gas piston should be free and unbound within the gas cylinder.

http://www.m14.ca/manuals/M1AManual.pdf

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Old 05-28-2012, 10:59 PM   #3
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Cattledog nailed it. Gas piston. When the bolt is closed, the piston is pushed to the forward limit of movement- no movement, no noise. But when bolt is open, piston can slide back and forth- unless your rifle REALLY needs cleaning.

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