Glock 35 gen 3 or gen 4
 

I have a glock 19 that I'm happy with that is a gen 4.

I was looking to get a glock for the range in .40,because this would only be used at the range I was planning on changing the springs and other parts around. (can't with the 19 because it is my carry gun) I was wondering if anyone had any experiences with finding aftermarket parts for the gen 3/4 and which you would recommend knowing I plan on changing things around.

I haven't done mods to my Gen 3 G35. It is my EDC and I haven't had one problem with it!! I like the Gen 3s over the Gen 4s.