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Old 03-25-2013, 21:00   #2
jasonub
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Join Date: Sep 2003
Location: Philippines
Posts: 3,359
im using 15 mainspring but you should at least have a koeinig set, limcat extended firing pin and titanium struts and caps for it to be reliable.

i also have a lightened slide and tungsten guide rod. i liked 12.5 ismi recoil spring till i tried an 11 pound rs ismi. I may soon go 10 pounds.

Rule of thumb for ipsc shooters is the lightest springs you can go with 100% reliability
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