Disassemble the gun, remove to bolt, and use your favorite oil based lubricant. I use a product only available at a Fastenal. Works better than anything else I've ever used. Move the extractor back and forth with your fingers while lubing. When it moves freely wipe the excess oil off and reassemble and test. Remember, too much oil is worse than no oil. If that doesn't get it, find the mechanism that actuates the extractor, and check for physical damage. Look for other missing parts, like a roll pin or the like. I was missing a roll pin on my AR bolt when I bought it and it wouldn't eject casings until the dealer I bought it from gave me a new bolt.
If so, try real ammo before stripping, unless the gun is dirty.
The steel bases or alloy bases do not spring back as much as brass bases, therefore the steel/alloy based b hulls stick.
I proved this Monday with a friend and his Norinco Outlaw (a side by side w/exposed hammers). Firing the cheap crap you had to break the gun open across the knee, but it was normal extraction using my stiffer reload in AA hulls.
Shortly after posting this thread, I found the problem. The front edge of the ejector has been broken, missing. This leaves a small gap-about 1/8"- between the end of the barrel,and the front of the ejector. The rim of the case jams into this gap, and pulls free of the bolt, leaving case in the middle of the action. Need ejector,ejector spring, 2 revits to repair-thanks for the replys.