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The smaller spring is a heavier firing pin spring, intended to prevent inertial discharges (with the slide slamming home making the firing pin go forward) caused by a HEAVIER recoil spring.
In guns with a firing pin block, and most have them, this is an unnecessary spring change -- if it's firing correctly, otherwise.
You could have gotten by with lighter recoil springs -- 14lb* would probably be closer to what was in there (before it wore itself out.) A heavier recoil spring CAN (that's CAN, not WILL) lead to a broken slide stop in the guns based on the CZ design (as is the case with the Witness and Baby Eagle), but generally, you'll not have a problem.
*Just checked the Wolff site: they say the "stock" weight for the Witness in .45/38 super/10mm (etc.) is 14lb., and CZ recommends 12lb (with 13lb-14lb. with hardball) for the .45 CZ-97.
If so, the 18-20 lb springs are a lot heavier than you need for the .45. The .22 kit will have it's own recoil spring.
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Last edited by Walt Sherrill; January 30, 2013 at 09:38 PM.
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