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GEN 3 vs GEN 4 SLIDE VS LOWERS COMPATABILITY

524 Views 1 Reply 2 Participants Last post by  mtstream
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 pros or conns from anybody? Thx Folks!!!!
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You'd end up with a meaningful gap between the frame and slide - the Gen4 frame is larger to accommodate the dual recoil spring. Even though you can get the parts together as seen below, Glock recommends against trying to interchange Gen4 frame, slide, mag catch, slide lock spring, recoil spring assemblies, trigger mechanism housing and trigger mechanism housing pin with Gen 1-3 (either direction). Any reason you don't want a G20 with threaded barrel?

 
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