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gen 4 parts

  1. Gunsmithing
    I've heard so many different stories when it comes to what Gen 4 parts will work on Gen 3's. Now with Polymer80, I've heard, well read, that some work and some don't. I am sure that this has already been asked, so if it has, can someone post a link? If not, I wanted to know every Glock 4 Full...
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