Just had a customer come in with a DPMS SS bull barrel upper that the ejection port cover was not staying closed. Under further inspection i noticed that it had a bulged upper, a broken extractor and bolt catch. Also as i was switching out the uppers i noticed this.
After i get the stuck casing out i will bore scope it and see if we can salvage anything.
Squib load maybe?
Dude, that’s DPMS’s latest high tech chamber coating. 
Haha that is freaking funny.
This stuck casing is being a bitch though. Anyone have any tips on how to get it out?
Modular brass chamber lining - no mess clean up, just remove the stuck casing!
That’s not a squib.
That’s case head separation.
Was it a reload or 5.56 pressure round?
He was worried because his dust cover wouldn’t lock shut? Looks like that was the least of his worries
They were reloads of course.
It’s a good thing he brought it in.
All I can say is wow, thats a lucky shooter that didn’t have that gun blow up in his face.
After talking with the owner more he was saying that when he fired the magazine ejected and the rifles didn’t sound quite right (i wonder why)
He survived with no scratches at all.
Looks like natural selection doesn’t get em all…
Try increasing larger cleaning brushes. Push past the neck from the chamber side, then pull back. The multiple wires usually will press against the case mouth and allow you to pull it gently out. Get the size right where the wires are almost straight is the trick. (IE: Not flexed, just bent rearwards)
Harder to explain than to do, it’s amazing how well it works. Won’t get every one, but worth a try as you probably already have brushes.
Since you’re already doing the work, just get the case extractor. They’re worth it.
Ouch, man he got lucky he didnt get hurt.
Whoa took me a second or two to see the stuck brass case. That’s scary.
5.56 ruptured cartridge case extractor.
http://www.brownells.com/gunsmith-tools-supplies/handgun-tools/stuck-case-removers/broken-shell-extractor-prod23311.aspx
What would cause a reload to have a case head separation like that? Too heavy a charge?
FL sizing too many times
FL sizing too many times
And overgassing can make it worse, as the case is yanked out while the brass is still under pressure and malleable. Stretches the brass a bit like excessive headspace would, just not as noticible.
You end up work hardening the brass. Its not always an excessive pressure thing.
Even with over gassing, the brass isn’t under that much pressure when it’s extracted
I’ve seen some shit but that takes talent.