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This is a leak i've had on my marq for a while now. I couldn't solve it quickly back when it started (1.5 years ago) and ended up using teammates guns at the time. I've pulled the gun out of my gear bag in an effort to fix it now that I have some free time and also b/c I'd like to sell the gun. Looking for some input from you other pbf guys who've owned marqs.

I DO NOT HAVE A PRESSURE TESTER. I do however have a gauge i fashioned that can hook up to the lpr.

The gun leaks down the barrel. I have replaced the #22 engine (two separate times!) o-rings and lubed them with dow 55. I'm trying not to be too generous with the lube but i'm applying a decent swab of it. Gun still leaked. I have now replaced both o-rings in the blast guide. Gun still leaks.

What next? I have a complete rebuild kit for the marker.
 

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