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Ismi Vs Wolff Mainsprings


gino_aki

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I've always used Wolff mainsprings for my trigger work, preferring the 17lb with a good sear (CMC or EGW) and STI Titanium hammers (when I can find 'em on ebay), strut, and cap. I wanted to lighten up the trigger in the "new" Para blaster I got, so went into my stash for the a 17lb Wolff I'd gotten a while ago...got it put together...can't seem to get it below 3 lb pull. Hmmm. Compare it to other Wolff's seems the same tho' without a calibrated spring tester, who knows? Order a 15lb ISMI from Brownells to try and whoa! that's light. Down to 1-1/2, but inconsistent ignition. My friend Ray says I gotta put in a standard weight firing pin spring, which can't be done as is 'cause I discover I have one of them SV replaceable breech face slides and the FP spring tunnel is short. Grrrrr. End up cutting a coil and a half off the 17lb Wolff and figuring to live with2-1/2~2-3/4. After shooting it a bit more and having other unrelated problems I decide to stick in a 17lb ISMI after a "feel" test determines that the 17lb ISMI seems lighter than the 17lb Wolff with a coil and a half missing. And it IS! Trigger pull down much closer to 2 and could still use a bit of tweaking but feels a lot better.

So...is 17lbs 17lbs or does ISMI set theirs differently? I do think I'll be using their mainsprings from now on and am setting the goal of getting that 1lb 6oz pull Ray is always bragging on with the 15lb one.

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Measure the diameter of the wire of both springs. If they are both the same they should be same#. If one is a smaller diameter then it is a lighter spring. Both have same number of coils? Both same length out of the package?

CYa,

Pat

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