My 8" Skeleton (Dan Wesson) now sports the spring carrier mod. It's variable between 350 and full on fps. It was a little funky to get it just right, but certainly is possible. I also kept the original spring block and spring intact so that if I ever want to revert back to stock, no problem. There is actually no modification to the chassis of the pistol. I removed a cross section from the spring block then added a screw adjust to the bottom so I can vary the fps taking into account our wildly varying temperatures here.
The mods on YouTube are good enough to get an idea of how to do it..mine is a variation of that. Our field limit here for pistols is 420 fps, and mine sits at 386fps with .2's. I run .3's as a BB weight and it works just fine.
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