CZ Extra Power Thumb Safety Spring - Review

[Tok36]

  I have been of the opinion that the CZ75/SP-01 safety could be more positive than it is in stock configuration. I have heard others mention this as well, in the case of carrying a CZ safety model this may come more into play then anywhere els. For me this is not an issue being that i prefer CZ decockers for defensive purposes. My safety models are range pistols for the most part.

  Regardless of my personal need of this upgrade part, i really like it when i see people offer specialty parts for CZ pistols. I feel that it enriches the platform for everyone involved. In this case it is the CZ Extra Power Thumb Safety Spring. I purchased a few of these springs out of curiosity.   

  I installed one of these spring into my SP-01 safety model to find out. The SP-01 unlike the CZ85 (CZ85 being a CZ75 with ambi controls) has a spring loaded safety detent only on the left side. The right side of an SP-01 has a insert without a spring. In a CZ85 and other short dust cover CZ75s there are springs on both sides, one for each safety lever. So one might get even more of an increase in safety lever tension when installed in a CZ 85 or other short dust cover CZ.

  A word on installation. The extra power spring is longer than the original factory part. This makes installation a bit more challenging because you have to compress the spring further to get the safety detent back into place. With the help of a metal probe, it took a few extra minutes to reinstall the safety detent with the extra power spring. While a bit more tricky, installation was easily accomplished. I might suggest leaving the extra power spring for the final touches if doing allot of upgrade work on a CZ. Taking it in and out a bunch of times could get tedious, the stock spring will be easier with repeated disassembly/reassembly.




Factory Spring - Top / Extra Power Spring - Bottom


  Extra Power Safety Spring pull weight comparison:  These measurements are the product of average of 10 pulls with a Lyman electronic trigger pull gauge. I had paddle safetys (Shadow safetys) installed on the SP-01 so the trigger scale had a better ledge to pull on for more consistent readings.

Stock Spring -   On: 1lb, 5oz      Off: 1lb, 0oz

Extra Power Spring - On:  2lb, 10oz    Off: 2lb, 6oz

  In the end the extra power spring approximately doubled the pull weight of the safety lever.  As stated above when installed into a CZ85 with two springs, one could expect an even greater increase in safety lever pull weight. I will test this in a CZ85 in the near future and add the results to this post.  I assume that the increase in tension can vary a bit from pistol to pistol due to differences in manufacturing.
The purchase of these springs was painless. An email and a few bucks through Paypal.  If anyone is interested there is a link below to the Dsperman website.

http://dsperman.com/

[cntrydawwwg]

Thanks Tok. Great write up. I may look into these[emoji6]

[2morechains]

I read about these on Enos and bought a 5-pack from Sperman as well.  My goal is the same as Tok's, to make it harder for the thumb safety to accidentally get flipped on.  Will report back once I get them installed. 

[NCTURBOS]

I may look into these as well, at least maybe for my Compact-L since it might find its way into carry rotation... However, I'm not concerned about accidental engagement of the safety, as like a 1911, I ride the safety with my thumb over top when firing. However it might help to make sure there are no accidental disengagements when carrying or unholstering...

K.

[himurax13]

Interesting. I have heard CAGLS complain about this lack of positive feel but my CZ's almost hurt while using the safeties since they have more of a positive feel than my 1911's.

However, I have felt the safeties on a regular SP01 that was worked on by some shop and the safeties were all loppy job.

I think I will give these springs a try but having the extended tumbler safeties and sear cage from the CZ75 Single Action, along with a right side spring detent, it should give any user the positive feel they are looking for.

I think the actual shape of the safeties themselves need improvement since the location where the pivot cannot be changed.  If the left hand safety was a little lower, a little wider, and was seated further back, I think it would make a huge difference.

[2morechains]

I finally got around to installing one of Sperman's extra power detent spring on my SP-01 Shadow.  Being that the D-style thumb safety only has a spring on the LHS detent I only installed one spring.  It made a difference.  Not huge, the thumb safety still goes on with a flick of the thumb but I did notice that it takes a little more pressure to engage. 

My 75 Shadow has the tumbler thumb safeties and both LHS and RHS detents have springs.  I may swap them out for Sperman springs but to be honest I've never had an issue with the thumb safety getting flipped up when I didn't want it. 

[gary2232]

I also have both styles os safety's my 75 Shadow has double springs and I never in 3 years of shooting matches did I engage safety accendently but my new SP-01 shadow with single spring I have had trouble. I installed extra power spring, it made it better but not as good as my 75. I filled the detention and added spring and it helped.

[rifmon]

I absolutely concur!  I bought and installed an extra power detent spring and it rates right up there with other Cajun upgrades I did.  I started a thread topic related to Mushy 75B safety.  The extra power detent spring made a permanent positive difference for my 75B and my confidence in cocked and locked!

[taylorkh]

Being totally new to CZ pistols I found the safety to be a concern on my recently purchased CZ 75 Compact.  A couple of members on this fine forum were kind enough to refer me to Mr. Perman's product.  I just completed installation. WOW!  The safety now feels and SOUNDS like it is actually engaging and disengaging. I am a happy camper    '

Ken

[holidaypf]

Being totally new to CZ pistols I found the safety to be a concern on my recently purchased CZ 75 Compact.  A couple of members on this fine forum were kind enough to refer me to Mr. Perman's product.  I just completed installation. WOW!  The safety now feels and SOUNDS like it is actually engaging and disengaging. I am a happy camper    '

Ken

Ditto.

[Rulejoe]

Yep. The Perman safety spring was great for me, too.

[Flip18]

Great info, thanks guys. Will have to do this mod to my Combat. Been going back and forth if I want to CC her.

[Hawker800]

Thanks, ordered mine.

[czluvr]

Just did both of my compacts tonight. Fantastic improvement. It gave me the positive detent I needed. I have big hands and constantly bumped the safety on. Problem gone. The issue kept me from being comfortable carrying it. Not now.

[Coldhammerforged]

Interesting. makes sense when running the gun hard you would not want the safety to be  engaged.

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