Michigunner,
I'd thought I'd like to see a .380 conversion kit for the R9 also. Lots of talk about a .380 ACP in the "Two New Models" thread.
Last night I dug out my handy-dandy NRA Fact Book and looked up the specs for the .380 vs. 9mm Parabellum. Even though the .380 ACP was originally called the 9mm Kurtz or 9 mm Short, there are quite a few differences in the cartridge dimensions.
Barrel / chamber dims could be easily accomodated; magazine would require new one with extended feed lips, new follower and spring. Biggest problem I can see is the breech face. .380 ACP rim diameter is only 0.374", while 9mm Parabellum rim is 0.394. I slid a .380 ACP round under the extractor of my R9S. There's barely enough rim for the extractor to grab. That would mean at least an extractor change to one with a longer hook. Considering the Rohrbaugh quality standards, we're probably talking about a new slide as well.
Maybe we could use the old, tired 250 round recoil springs from 9mm practice. That'd save about $4....
sslater