Someone posted a huge fix for this. In short take your slide off the gun. Then put a loaded magazine in, look at the slide lock release's little nipple thingy that is sticking out. It will most likely be almost touching the top bullet in the magazine. That little nipple is the culprit. The fix is to just shave it down a bit. I had this problem only with WWB because it is so fat at the end and UMC tapers more towards the tip and worked fine. Hope this helps.
Sorry Rockhillarms, I guess I skimmed through your message to quickly and didn't realize the actual problem. The fix I was talking about is when the slide stays locked back and there is a casing in the chamber that was never ejected. The culprit being the next round in the magazine that is getting caught on the slide lock release not letting the slide continue forward to extract the casing. Your post sounded the same and I jump to a conclusion.
hope you fix it.
i went to the springfield challenge when it came to memphis.
the guns we were shooting had been shot many thousends of rounds that week end.
they were very dirty. i had a couple of times the pistol was shooting lock up like you have discribed. it was very difficult to clear the jam.
like was said use the rear sight to put force on the slide or run a dowel rod (that will fit in side of the cart. case)down the barrel and push the case out of the chamber.
eather way it may take a lot of force.
if you can get the slide back a little you could also take a tool and release the extractor from the case and the slide will come back easyly.then field strip the gun and use a dowel to drive the case out of the barrel.
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