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  1. R

    new chiappa M4-22 upper on new plum crazy lower will not fire

    Olddog-newtrick, did you ever find out what the problem was? I have the exact same problem with the same set up. Seems like the hammer isn't even hitting the firing pin. I removed the bolt carrier group from the upper to take a closer look. Seems I can't even make the firing pin protrude...
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