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To: TheDandyMan

A light sheen, The AR is a piston, pistons need some oil the most common problems is to little oil and to much oil.


5 posted on 05/11/2016 7:51:37 AM PDT by riverrunner
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To: riverrunner

This Ruger might be piston but most others are gas blowback directly to the bolt.


10 posted on 05/11/2016 8:01:18 AM PDT by Gaffer
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