So, I recently installed a Midwest Industries MLOK rail and MI gas block on my M&P10. Before the installation, the rifle seemed to function fine but I only fired around 200 rounds. It had no cycling issues and was very accurate.
Today was my first time out shooting since installation of the rail and gas block, and I had accuracy issues, shooting up to 6 inch groups at 100 yards. I wasn't able to get a good zero, which was my goal today.
I also began having cycling issues which became worse the more I shot. By about 50 rounds my rifle was completely single shot, and would not strip a round out of the magazine.
Two types of ammunition were tried, PMC and ZQI. Multiple magazines were used with the same effect.
I'm fairly well-versed in building ARs, and have never had a problem in the past. This one has me stumped.
Does anyone have any ideas as to what could be wrong? This rifle was supposed to be done today, but now I'm back to square one. Thanks for your time.


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