I took out the replacement gun and fired 99 rounds of Blazer Brass 95gr FMJ (round nose variety) and had 1 failure. The extractor did not budge during those 99 shots and for the first time in recorded history I managed to retrieve 99 pieces of brass, a couple were out of round but nothing like what I was experiencing before.
I did testing with the new mag and the original mag, the one failure I had was with the old mag, I had a premature lock open after the third of six shots. Other than that all was well on this trip. More testing to follow.