Recommended spare parts list?
I looked back several pages and couldn't find anything definitive. If I've missed the "what spare parts should I have?" thread, please point me to it.
I have a Gen3 G19, and I'm considering getting a Gen3 G32 w/ a LW 40 barrel (so I can shoot lead 40's).
Other than a few extra mags on hand, I have no parts.
What stuff does the well-stocked spare kit have in it? Among these pieces, what parts are interchangeable between the 19/23/32?
Well the early Gen3 G19's didn't have a locking block pin, so the locking block was different. Among Gen3 19,23,32 frames that do have a locking block pin, the only part that's different is the trigger housing w/ejector, there's one ejector for 9mm and one for .40/.357. Also among those models, the slides are different between the 19 and 23/32. The 23 and 32 share the same slide with all internal parts, they share the same outer dimensions of the barrel, only the bore of the barrel, magazine tubes, and followers are different.
G19 frames without a locking block pin shouldn't be converted to a higher caliber obviously. G23 frames with a serial number prefix before CPU should not be converted to .357SIG, they didn't have the metal extensions on the front frame rail insert to stop frame battering which is necessary for .357SIG.
My personal list of importance for spare parts:
1. Guide rod assembly/RSA
2. Trigger spring
3. Slide lock spring
4. Spring loaded bearing (small and easy to lose when detail stripping)
5. Firing pin spring cups
6. Slide stop
8. Frame pins
I personally have a spare of every single spring. When I bought my first spare parts I also made sure to order spares of the smallest parts because they're easy to lose, like the spring loaded bearing, firing pin spring cups, firing pin safety spring, and extractor depressor plunger spring.
The Gen4 19,23,32 obviously have a different frame with magazine catch, slide, and guide rod assembly. The barrels are also slightly different but they're still interchangeable with Gen1-3, the crescent-shaped cut-out on the barrel lug for the base of the guide rod is wider. The trigger bars are different between Gen3 and Gen4, but either will still work in either Gen. Gen3 trigger housings won't work in a Gen4 and vice versa. The locking blocks are also different between Gen3 and Gen4 compact models, the Gen4 locking block has some extra material on the sides and I think they're a little longer from front to back, currently only glockparts.com sells Gen4 compact locking blocks. The Gen4 compact slide lock spring is also different, again only glockparts.com sells it.
Another thread discussing the same question. Hope it helps.