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Alex,
The last time I saw a pistol that had safeties that engaged wantonly, it was due to the hammer not sitting in the proper location. Upon closer inspection, I noticed the hammer was actually missing the pivot bushing, causing the hammer to sit lower than it should. Thus, when the hammer was down, the part that blocks the safety levers from engaging ended up not being there.
The second symptom of this problem, was a very stiff trigger pull... just like you're describing. Because the hammer is not sitting in the right location, the engagement angle between the hammer hooks and the sear changed.
As for whether it's a 5.1 sear or a 1911 sear.... a 5.1 sear would be impossible to install in a 1911. The mount is completely different, so that's not your issue.
So... I'd check to see if you have the hammer pivot. Part number for MEU is GM4-44. If you happen to be missing it, send me a PM. I have a few here.
Brian
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