Who Knew Posted May 25, 2014 Share Posted May 25, 2014 I've had an issue with my Mossberg 930 so I was test firing it today after a thorough cleaning. When I came in I noticed oil looked like it was coming through the barrel where it steps down just outside of the receiver. Before cleaning I noticed a white cloudy substance with the consistency of dirty grease in the same spot. While cleaning the original substance off I didn't think much about it because it had been through two matches, one of which was TFD that was a mud-fest. After test firing less than 50 rds I noticed the oil. If there is a crack, I can't see it with my bare eyes and I don't have anything with magnification. Anyone ever seen this before? Link to comment Share on other sites More sharing options...
mpom Posted May 25, 2014 Share Posted May 25, 2014 The line running perpendicular to bore is normal, but mine does not have what appears to be a line parallel to bore. Link to comment Share on other sites More sharing options...
Steve RA Posted May 25, 2014 Share Posted May 25, 2014 I don't see one running parallel to the bore ??? Link to comment Share on other sites More sharing options...
blue edge Posted May 25, 2014 Share Posted May 25, 2014 What rear sight is that? Link to comment Share on other sites More sharing options...
Flatland Shooter Posted May 25, 2014 Share Posted May 25, 2014 Next time you shoot it, wipe off the oil and wrap a sheet of white paper around the forearm and barrel. Fire a few shots and see if the paper is marked or damaged. Hopefully it turns out to be nothing and the oil came from under the rear sight and dripped down when it heated up during firing. Bill Link to comment Share on other sites More sharing options...
Who Knew Posted May 25, 2014 Author Share Posted May 25, 2014 What rear sight is that? Hi Viz set on lowest setting with factory front. I don't see one running parallel to the bore ??? Correct, no visible lines parallel to barrel. The perpendicular line is actually where the barrell steps down in size and where I'm concerned there could be some sort of crack. I cleaned the oil off last night and plan on shooting a bit this afternoon. Next time you shoot it, wipe off the oil and wrap a sheet of white paper around the forearm and barrel. Fire a few shots and see if the paper is marked or damaged. Hopefully it turns out to be nothing and the oil came from under the rear sight and dripped down when it heated up during firing. Bill I'll give this a try. I know the oil didn't come from under the sight but could be possible it dripped down off the rib, but doubtful. Link to comment Share on other sites More sharing options...
mpom Posted May 25, 2014 Share Posted May 25, 2014 Every time I clean and oil the chamber I get a little oil seeping through that joint line. Thought OP was referring to what looks like a line under the big drop of oil. Link to comment Share on other sites More sharing options...
blairmckenzie1 Posted May 25, 2014 Share Posted May 25, 2014 its where the barrel is soldered together. I've seen one other mossberg do that before. Link to comment Share on other sites More sharing options...
Who Knew Posted May 25, 2014 Author Share Posted May 25, 2014 Every time I clean and oil the chamber I get a little oil seeping through that joint line. I think that's what may have happened but is that not a concern that oil is coming through the barrel at any point? I did clean this area of any residual oil and put another 35 rds through it this afternoon with no more signs of oil seepage. I even taped a piece of toilet paper over that area to see if any dirty gas or oil might transfer onto it. So now I'm just thinking this is kinda weird but I'm going to keep an eye on it and if anything changes I will update Link to comment Share on other sites More sharing options...
mpom Posted May 26, 2014 Share Posted May 26, 2014 Thought it was weird as well, but seems normal. Doubt there is anything wrong. Link to comment Share on other sites More sharing options...
9146gt Posted May 26, 2014 Share Posted May 26, 2014 Heat the spot with a propane torch...bet you then can see the crack. Many cracks start from the lack of a radius on a inner shoulder. Tom Link to comment Share on other sites More sharing options...
Nolan Posted May 27, 2014 Share Posted May 27, 2014 This is what that will eventually look like. Mine started out just oozing the white stuff which I think if flux from where the barrel and barrel extension are silver soldered together, eventually it started leaking gas badly. I bought a second barrel since Mossberg wanted 6 to 8 weeks to repair the complete shotgun. Within a couple of weeks the second barrel was oozing flux as well. Mossberg to their credit sent me a third barrel free, but it's oozing crap as well. Nolan Link to comment Share on other sites More sharing options...
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