These "Conversion Kits" had better give you a correct new .380 barrel & slide combination, at least one new .380 magazine, a new .380 extractor, a new .380 ejector and a new .380 recoil setup. . . . . and yes ~ You will need a gunsmith of good character to fit them all on your R9 frame. (I wouldn't do that to an R9)
If not. . . . . Stay away from them! . . . . . (Run Forest ~ Run!)
Regards,
Eric C. Rohrbaugh