Intrepid wizard: Hmmmm, that problem with the dual recoil springs is new to me. I've owned more than a dozen of those P-38/P-1s over the past 40 yrs and never, ever had a problem with them. One was so old - Mauser wartime production that had seen much use, that the firing pin and loaded shell indicator cover flew off at the range one day, and it just kept on shooting through the remainder of the 500 rounds I had taken out.
I have seen those things use and eat hot loads and malfuntion on squib loads but never give out. I still have two left, both P-1s. One is over 36 yrs old and the other is just a tad younger. I still shoot them and they are a blast and never had a misfire or malfunction with them as long as I use the proper ammo. Mikey.