The Original CZ Forum
CZ PISTOL CLUBS => CZ75, 75b, 75 SAO inc the Transitional => Topic started by: kyron4 on June 04, 2015, 09:38:34 AM
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My 75b trigger is crisp and smooth, but DA coms in at 13 lbs and SA at 7 lbs. I replaced the hammer spring with a Wolff reduced power 15 lbs. spring hoping for some improvement . It only dropped it 1 lbs. in DA and just under 1 lbs. in SA. The stock spring was 20 lbs, so a 5 lbs. drop only dropped the pull 1 lbs. Would a 13 lbs. even make a difference going from 15 lbs. ? Does the reduced firing pin block spring from CGW make much difference ? What's the best I could hope for without swapping out hammers or sears ? -Thanks
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Trying a lighter hammer spring is a fairly cheap experiment. My SP-01 Shadow originally came with a 13 lb hammer spring from CZC. It also had the extended firing pin and reduced firing pin spring installed. IIRC the original DA pull was a hair under 8 lbs. After several thousand trigger pulls it dropped to about 7 3/4 lbs.
I changed out the 13 lb spring for an 11.5 lb and the DA pull dropped to mid 6's. Then again mine has been internally polished and has the CZC Shadow/Comp Hammer -but my understanding it the hammer mainly affects the feel of the SA pull. Give the lighter springs a try, though recommend if you drop into the 11-13 lb range you also get the extended firing pin and reduced firing pin spring. CZC or CGW sells them (~$25 I think). I shoot CCI primers and they all go off with the lighter spring/firing pin combo.
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There's also the issue of using different types of springs. There's no industry standard for how to measure springs, so a fifteen pound spring from Wolff and a fifteen pound spring from someone like CGW won't behave the same way. They may be close or not. David at CGW has done a lot to produce a wide variety of high quality springs, and when I want to respring my CZs, that's where I go.
Go down at least as far as 13 and start thinking about replacing the hammer. Polishing up the internals will help some, too. ;)
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FWIW, I bought the CGW spring kit (SPGK1) below for my 75B Omega and saw a marked drop of DA trigger pull weight. Although it never claimed to reduce SA trigger pull, I also saw an improvement in SA.
http://www.cajungunworks.com/ultra-lite.html
Here are my before and after readings:
Before:
DA = 11.5lbs
SA = 4.5 lbs
After (SPGK1 + polished the trigger bar as well as the DA roller):
DA = 8 lbs
SA = 3 lbs
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FWIW, I bought the CGW spring kit (SPGK1) below for my 75B Omega and saw a marked drop of DA trigger pull weight. Although it never claimed to reduce SA trigger pull, I also saw an improvement in SA.
http://www.cajungunworks.com/ultra-lite.html
Here are my before and after readings:
Before:
DA = 11.5lbs
SA = 4.5 lbs
After (SPGK1 + polished the trigger bar as well as the DA roller):
DA = 8 lbs
SA = 3 lbs
Did you use the stock firing pin ? Any issues with light strikes ?
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FWIW, I bought the CGW spring kit (SPGK1) below for my 75B Omega and saw a marked drop of DA trigger pull weight. Although it never claimed to reduce SA trigger pull, I also saw an improvement in SA.
http://www.cajungunworks.com/ultra-lite.html
Here are my before and after readings:
Before:
DA = 11.5lbs
SA = 4.5 lbs
After (SPGK1 + polished the trigger bar as well as the DA roller):
DA = 8 lbs
SA = 3 lbs
Did you use the stock firing pin ? Any issues with light strikes ?
Yes, I'm still using the stock firing pin. Initially, I was concerned that I may need the extended firing pin, so I wrote to David from CGW who assured me it'll be fine.
Although I use almost exclusively Freedom Munitions ammo (remanufactured and new, 115gr/124gr/147gr, RN/JHP/XTP), I have shot some factory ammo I got from Walmart and LGS (Federal, PPU, Remington, Winchester, CCI). No issues in performance whatsoever while using the SPGK1 spring kit. Every ammo ignited.