odie64 Posted May 20, 2017 Report Share Posted May 20, 2017 I noticed some moisture in my upper receiver at the top after my initial range session with my PSA PA10 Build. The rifle functioned flawlessly and I was using Sellier & Bellot .308 (147gr??) ammo. It's hard to tell but it looks like it may be coming from the gas tube. The rifle has PSA (fn) 14.7 barrel with a pinned and welded SilencerCo 7.62 specwar muzzle brake. I have other AR Platform rifles in 5.56, 9mm and 300 blackout and never noted this on any of those calibers. This is my first 308AR rifle, is this common or signs of something wrong? Quote Link to comment Share on other sites More sharing options...
mineralman55 Posted May 20, 2017 Report Share Posted May 20, 2017 Maybe PSA built a water-cooled version? Sorry, couldn't resist. It's probably nothing. Quote Link to comment Share on other sites More sharing options...
odie64 Posted May 20, 2017 Author Report Share Posted May 20, 2017 Well you know it IS a Gen 2. I didn't have a function issue and it did not seem to be a safety issue. I just posted to see if I was the only one that had this Quote Link to comment Share on other sites More sharing options...
98Z5V Posted May 20, 2017 Report Share Posted May 20, 2017 Lube. Whatever lube you use - the heat from firing is separating the lube components. Quote Link to comment Share on other sites More sharing options...
survivalshop Posted May 20, 2017 Report Share Posted May 20, 2017 26 minutes ago, 98Z5V said: Lube. Whatever lube you use - the heat from firing is separating the lube components. Or if the rifle was stored in an air conditioned space ( home , Auto ) before the range ,its possible it could be condensation formed when brought out into the heat . You need to first actually determine what it is , water ( moisture ) or separation of the Lubricant as described above . Quote Link to comment Share on other sites More sharing options...
98Z5V Posted May 20, 2017 Report Share Posted May 20, 2017 It's completely atmospheric, as well - it may be the same for the other weapons platforms fired, but vastly different weather conditions at the time of their firing... Quote Link to comment Share on other sites More sharing options...
odie64 Posted May 20, 2017 Author Report Share Posted May 20, 2017 I did use some grease to lube the threads on the barrel nut when I assembled the upper. It does seem to have an oily property to it. If that is the case I suspect after a short time it will dissipate completely. Quote Link to comment Share on other sites More sharing options...
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