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  1. Gunsmithing
    I would really dig a compatibility chart for Glocks? What I want to do is Buy me a new/unissued FDE Gen 4 G21 frame,box, mags, straps and a G21 Gen 3 Upper then install a 6" threaded 10mm barrel and whatever it needs, extractor or firing pin or whatever and have what I want? Any help, sites, any...
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