CZ SP-01 Mods

Tongarirohiker

Tongarirohiker

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I've seen recommendations that to improve the SP-01, I could change the recoil spring, the hammer, ejector spring, etc. Further more, if I wanted to get into IPSC, these changes would be legal for production. However, I don't really understand the effect that these changes would have on the gun. Can someone shed some light on this?

Also, who would you buy CZ parts from in Canada and typically has stock?
 
To be production legal, you cannot replace any external part that is not of the same profile as an OEM(CZ) part or any option provided by CZ. Springs can be replaced as long as it meets the minimum trigger pull. Sights can be replaced as long as the slide is never altered. Grips are OK as long as it is the same profile as original. No wrap-around allowed but grip-tape is legal. Sear-hammer engagement can be modified to minimize camming action when trigger is pulled SA or DA though not really an issue for this SPO1 already has a better trigger pull. Just replace the Mainspring and the Recoil Spring, and you are good to go. I got my Recoil Spring, Mainspring, Firing Pin Spring and Extended Firing Pin from Scot of Cedar Valley Hunting which is now Rouge River Arms. Call or email them.
 
Thanks, ambi. That clarifies how the springs are legal for production. I'm still fuzzy on why I would do these things. What will feel different with each spring I change?

Also, what benefit would I get from an extended firing pin? Preventing light strikes?
 
Light strikes can be prevented with Extended Firing Pin and complementing spring. For reloading, Winchester and Federal primers works good for me. I had some odd no-fire situation with CCI primers. I have to strike it 2nd time to fire. With mainspring change, you get a noticeably lighter trigger pull. With recoil spring change, you can use lighter loads. Just make sure you meet a minimum 125 PF to be on Production Class. Safe shooting!
 
Going to a lighter mainspring (the one which powers the hammer) results in a lighter single action trigger pull and a lighter double action pull at the same time. While techincally this can run the risk of light strikes in practice the usual 13lb mainspring is still pretty safe with MOST ammo primers. I run a 13 lb mainspring in both my CZ's and I can't recall having any light strikes over the last 12,000'ish rounds shot through the two guns.

The recoil spring should not be changed unless you are shooting ammo other than factory. Factory ammo meets the power factor by a sizeable comfort margin. If you reload your own ammo down to a "safe" power factor of 130 (IPSC) then it's noticably softer in recoil than most factory ammo. And the softer energy of the recoil often requires a lighter rate recoil spring to match the ammo so that the gun will reliably lock back on the last round.

But if you stick with factory ammo then the stock recoil spring is the right spring to use. Switching to a lighter recoil spring while using factory ammo will result in needlessly battering the slide against the frame with each shot since the lighter spring isn't strong enough to soak up all the recoil energy. And it also results in a gun which jumps in your hands more than if you use a recoil spring that is correctly matched to the ammo you are shooting.
 
Let's clear a couple things up, first off only sights and grips can be swapped out with non OEM parts, and for grips they have to be of the same design and size/shape as factory ones. Springs must be factory, no after market ones. Polishing and deburing of parts and minor fitting is allowed. That doesn't mean reshaping hammer hooks or sear faces to get rid of camming.
In my Steel Challenge gun I run an 8.5lb hammer spring and have no trouble with light primer strikes using Federal primers, I've only had a couple light strikes with factory ammo using that spring, everything from Winchester to S&B. If I go back into IPSC I'll use my factory 11lb hammer spring. Good luck finding one though, I got mine in Greece at the World Shoot.
If you are going to run the 11lb recoil spring see if you can find some shock buffs, they will save your slide lock levers big time.
 
I am thinking of picking up as SP-01 for IPSC production but I am having trouble deciding which one I should go with, the SP-01 tactical or the Shadow. My preference is the tactical because of the decocker , but is the Shadow actually a smoother or better tuned platform to run than the Tactical? If it is, can the tactical be cleaned up to run just as smooth while staying production legal?

I have just started shooting IPSC and have done two matches since my BB in January. I see so many people running a Shadow, but no one has the tactical.
 
you don't want the decoder because it makes for a heavier trigger pull. It's a little freaky at first but not hard to manually drop hammer-just make sure you have hold of it and watch for oily hammer and fingers.
 
Tongarirohiker said:
Thanks, ambi. That clarifies how the springs are legal for production. I'm still fuzzy on why I would do these things. What will feel different with each spring I change?

Also, what benefit would I get from an extended firing pin? Preventing light strikes?
Click to expand...

How much trigger time do you have on this thing? Is it working fine now for you? There's the old saying "Don't fix it till its broke"............
 
Dr.K said:
How much trigger time do you have on this thing? Is it working fine now for you? There's the old saying "Don't fix it till its broke"............
Click to expand...

My question was merely out of curiosity, as I see those recommendations all over the interweb. To date, I have put through 625 personally, and in total 800 rounds have gone through it. I've learned that it prefers 124gr AE or Blazer Brass over anything else I have available. 115 always seems to hit low.

It feels broken in. Only thing the jury is still out on is the sights. I've filed the notch on the rear sight so I can see more light around the front sight. I'm thinking of changing the front sight to FO and a completion sight on the rear. Otherwise, it's now my second wife.
 
Right now I love it just like it came out of the box, after 500 rds the trigger just seemed to smooth out, and I bought springs, but they are now in the spares box..

I'm leaving it alone and enjoying the honeymoon
 
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