I was going to post this, the key is to get enough bristles past the case mouth.
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26 Inf. made a good recommendation for penetrating oil. Kroil is the go to oil for the vintage rifle shooters in my area. It does a bang up job of cleaning filthy bores and hard to reach places on old rifles.
Don't get too aggressive with metal objects inserted into the chamber end of the barrel. Once the brass is removed, I would closely inspect the chamber and leade for damage.
Penetrating oil did not help. I give up, maybe a gunsmith can do it.
Take it to a smith who works on ARs. If not, carefully follow the steps outlined in post #12 and you should get it out. When you break the seal between the case and the chamber and the penetrating oil get in, (given time to soak) you should be able to extract the case.
Before getting mechanical I'd pick up 2-3 sizes larger than bore cleaning brushes. Stainless or at least bronze. Then start small, and firmly push them in until it stops. IE: jammed into the bore past the end of the chamber.
You want the bristles pushed back at 45-6 degrees. And then pull it back. It may take more than one attempt. If that doesn't work try the next larger size.
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Iraqvetern8888 show's how to remove these using cerrosafe from Brownells. Plug the barrel, heat it up, cast the chamber, let cool, and drive out the casting/brass from the muzzle end.
https://youtu.be/PDKBrKtN1OA
http://www.brownells.com/gunsmith-to...y-prod384.aspx
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