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I bought a used Gen 4 34 slide. It came with barrel and RSA but needs other internal parts. What are the differences between Gen 3 and Gen 4 upper parts kits. Can I get by with Gen 3 upk for range use?
 
My understanding is its the compatibility with the frame and slide that are the problem. I kinda want to know what you got your slide and barrel for, but it will just make me jealous.
 
My understanding is it's the compatibility with the frame and slide that are the problem. I kinda want to know what you got your slide and barrel for, but it will just make me jealous.
Yep since Gen4s went to the dual RSA and I think they changed barrel lugs as well
When I had a G17 gen4 with a gen3 slide, I just needed an adapter for the recoil spring to fit properly between the frame and slide
That thing ran like a top, now I miss it 🤣😭
 
Here is a Glock Generation parts compatibility chart…

 

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