I'm gathering parts for a mostly non-Glock G19 Gen 3 experiment. I started looking around to see if there are any differences in the barrels because my plan to use my G4 slide failed miserably when it didn't fit the GGP frame. If I can use my Gen4 barrel, great! If not I need to start looking for barrels.
It looks like most manufacturers list their barrels as 1-5 compatible and I've seen one reference stating the Glock Armorer's Manual doesn't call out different Gen3-4 barrels (but I haven't looked in my copy yet to verify).
So has anyone run into any issues using a G4 barrel in a G3?
Thanks!