The Original CZ Forum
CZ PISTOL CLUBS => CZ SP-01 and variants => Topic started by: Spark Shooter on June 13, 2009, 12:39:57 PM
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My shadow is a stock canadian model. I've read through all the spring posts and I can't find a consistent answer for the Shadow stock spring. I can gather that the stock mainspring is ~18lbs, i had the trigger pull tested by a smith, and the SA averaged 3 lbs 11oz and the DA was higher than the scale would read (max 12 lbs digital scale). I'm assuming due to leveraging reduction I won't get a 1:1 reduction if I drop the mainspring to 15lbs, what is everyone getting trigger pull down to (without a trigger job), should I expect around an 8-9lb DA pull now? With the SA it shouldn't change too much due to the SA being predominantly affected by the sear? Thoughts?
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if you drop to a 15# to 13# mainspring. IIRC you will get it into the 8# range and the SA should drop to around 3# ( less pressure on the hammer pushing onto the sear.) This is without doing any other polishing.
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So a 15 or a 13 lb spring would get me about 8 lbs DA and 3lb SA?
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I changed mine out to a 13# spring. DA pull is just over 5#s, just enough to get you past the IPSC 5# test for trigger pull. I have had no problems with light hammer strikes using the 13# spring using Win, Fed, and CCI primers. Remington primers seem to be harder, or the last batch I had were and don't use them anymore.
Take Care
Bob
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Thanks Bob, that's the answer I was looking for. I don't use Remington only CCI or Federal. I'll switch it out and run some through at practice this week to check reliability. Do you run an 11lb recoil spring as well?