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Found 1 result

  1. This is a thread I started in a FB group but figured it would be better suited here. Looking forward to hear your experiences and feedback. I will update as i continue testing. So the other day Steven posted about "most" drop in triggers not working in PCC and asking if anyone has welded the bottom of their bcg to help with reset. Some people have and that has worked. I have been having issues with drop-in triggers in my PCC and wanted to get to the bottom of "why". I happen to own a PCC as well as an ar15 so I just finished up some measuring and I believe I have it figured out. -9mm is a QC10 upper and lower with a NFA standard BCG. Elftmann AR10 trigger -AR15 is a Radical Firearms upper, Spikes Tactical lower, with an Aero Precision BCG. CMC trigger ****side note**** while my CMC trigger functions flawlessly in my AR-15, when I just swapped the uppers, the CMC will not even reset when cycling the bolt manually in the ar9. 1. I used a razor blade as a bridge across the bottom of my upper. The razor blade measured .037 thick. 2. I first measured the 9mm from the razor blade down to the bottom of the BCG that resets the trigger. The measurement was .345 with the blade so .308 without the blade. 3. Next I did the same thing to the AR-15. The measurement was .300 with the blade so .263 without. That means the BCG on the AR-15 has .045 more material pushing down on the hammer and resetting the trigger. Someone in the last thread suggested welding the bottom of the BCG approximately .040 thick which would be ideal. Is that the answer to the drop-in trigger problem? The next thing would be which 9mm BCG measure similar to the AR-15 BCG? Am I going down the right path here to find a solution? I am curious to know what others think. The pic is to help show how i went about taking the measurement.
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