u/webguerrilla

I just recently purchased an Ultra Mass guide rod and a PMM comp for my Pro SD Compact. I got the 3 spring pack with the guide rod. I’m wondering if anyone with a similar setup can tell me which spring would be the best. The ZR site says the 15 lb spring won’t work with the ProXPMM but I’m not sure if the applies to the SD with the standard comp as well.