I wouldn't count on the RM380 springs working in the Rohrbaugh 380. I believe they have a different recoil setup than ours. . . . . . But, not having one of the RM380s in my hands, I could be wrong. Frankly, if you have a Rohrbaugh 380 outer recoil spring. . . . . just stretch it out a little bit and put it back in. . . . . You should be fine. (Inside info) These guns are not brain surgery. . . . . (respectfully speaking here everyone) . . . . . Unless you have shot 3,000 rounds through your R380, I don't think there is much issue with the shot count and replacing the outer recoil spring on them. They are much more forgiving the R9.
Eric R.