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Or did you (hecklerjg) mean the 416 trigger internals into a brand new empty M4 lower receiver? Because that should work too.
I'm actually running the 416 upper on my M4 lower. Just like the guide said, you have to check the tolerances on the pins. I had to run a drill of pretty much the same size as the hole through it a few times to remove burrs etc before it fit perfectly.
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