Got that Jim. We could never get our C-7.62mm spec Browning to function more than a few rounds.
As for the .50 with the quick-change barrel....... Words fail me. I used to tell the trouble shooters. I used to tell the trouble shooters that the original gun worked on good basic physics. The modified guns FAIL due to bad basic physics in the form of metallurgy.. Dolf Goldsmith spent an hour telling them too............