So I know this is mostly dedicated to an AEG gun doc but....
I was sent an M4 to look after. Took it apart.
....and look at what I found!!!
This was a build up of "lube gunk". The owner complained that it no longer fired and would vent gas on the first pull of the trigger.
I surmise that because of the cold gas venting from the magazine, it completely froze the gunk up and made it super hard.....
This is what happens when you don't take care of business like you should, fellahs.
The gunk was soooooo thick and hard that it didn't return the bolt all the way such that the loading muzzle and gas route packing on the magazine didn't line up. Ergo, all the vented gas.
Look at how thick the fucker is!!!
That's one helluva lot of lube....
I had to mildly heat the muzzle up just to get it off because it was soooo compacted in there good and tight that it refused to be scraped off.
Frack!!!!!
This is the side effects:
notice how much of the bolt was still sticking into the buffer tube. This prevented me from properly taking the upper and lower receiver apart. I had to undo the front pin and completely separate the two halves just to get the damn bolt out....
I don't know what the hell kind of lube this guy was using but...WTFBBQ!?
Also, why the hell would this be all over the loading muzzle anyways!???
Anyways, problem solved. Gimmie my $50 fee....
...or a carton of Belmonts. Large Kings.