I have a line on a guarder reinforced 6mm i was working on.
This Might help. I was working on a M4 with a NON ported Piston head.
It was getting serious blow by, I removed the oring and put a small layer of Oring lube in the channel and reinstalled the oring, brought it up to Spec on the first shot.
With that Piston head you shouldnt have this issue but it might help.
also after a shot or 2, any excess will be forced past the Oring (due to air through the ports) which will help the seal and lube the Cylinder.
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A single Light is all one needs to find their way through the darkness, But a single BB is all you need to bring it on!
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Im not worried about the Bullet that has my Name on it, Im worried about the bullet that says "to whom it may concern"
Lt. Alexander Washington -(Red Tails 1944) Ret.
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