I tried, I REALLY tried to get my P938 spring into the P380. Unless my 2 yr old recoil spring is longer then the current one, I don't see how it could be done unless I cut it. I found it to be almost fully compressed when I was about to seat the guide rod. I just couldn't get the front of the rod through the slide. I got it that far by using the 'ol dowel rod through the front of the slide and into the spring to keep everything lined up but just couldn't get it. Then, I struggled getting the spring off the guide rod. It would not slide or pull off. I used a flat blade screw driver to compress the spring end on the guide rod which opened it up enough for me to move it up a speck at a time. It was quite an experience. Anyway, charczard, let us know how things go! Thank you.
Kahr P380 x2
Kahr K9
Kahr CM45
Sig P938
Sig P365 x2
Sig P322
1911 Range Officer 9mm
M&P 9mm