A friend and I went shooting the other day. We shot our pistols, no problem. Then he wanted to try his new upper he got from a local builder. He shot a mag, then handed the rifle to me with a new mag. I fired several rounds then PFFFT and a cloud of smoke. The gun was locked up. The charging handle wouldn't budge. We packed up and he took the rifle to an armorer he knew who dug out a split case and a broken extractor. He said it was Federal .223 rem 55 grain FMJ Walmart box.
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