CZ 75 SP-01 Shadow spring upgrades

thegrandpoohbah

thegrandpoohbah

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My new Shadow just arrived (thanks Wolverine!). Am I correct in my understanding that a 13# main spring and 11# recoil spring replacement will result in a much nicer trigger? Am I also correct in understanding that this will still result in a handgun suitable for IPSC Production Class as these are factory CZ parts? What, if any, is the benefit of the stainless steel guide rod? Thank you.
 
I kept the stock recoil spring, and the guide rod- personally, I can't see that the stainless one would be any better- but yes, a 13# mainspring will make a huge difference to an already great trigger.
 
The 13# mainspring is where much of the trigger improvement comes from. From there some gunsmithing to smoothen up the parts that rub is where the rest of the improvement comes from.

The recoil spring does not in any way affect the trigger. And in fact you're better off with the stock recoil spring unless you are loading your own ammo and loading it down to just barely making the power factor. If you do that THEN you need the lighter recoil spring. But if you're shooting factory ammo or factory power level reloads then stick with the stock recoil spring. If you use factory power level ammo with a lighter recoil spring you risk the slide beating against the frame at the end of the stroke and over time doing some damage. Broken slide stops is one item that breaks quickly on a gun with the wrong recoil spring for the ammo.
 
Only benefit I can see to the SS guide rode is it won't break. Not that the poly one is fragile or anything, but y'know, stuff happens.

you can get the spring and rod from dlask, they're cz parts so they should keep you in production? I guess? I'm not super up on IPSC rules. However the 13 lbs recoil spring doesn't change anything in the trigger, it only makes racking the gun itself easier. You can find lighter mainsprings that improve the DA pull. Dlask might have those. Otherwise I know a guy you can email about getting CZ custom parts up in Canada.
 
The polymer guide acts as a recoil buffer pad too and cheap to replace if it does break. The stainless guide is not really necessary unless you have to have it.
My Shadow is already at 3.5 lbs single action with stock mainspring. I don't see the need to replace it unless they already come equipped with 13 lbs one.
 
You'll need a lower power recoil spring for 147 gr bullets at 130-132 power factor (or may be have some ejection issues). Usually 11# or 13#.
If you change main spring to 11# it may result in light primer strikes which can be cured by longer firing pin. All parts are factory available from CZ = Production friendly. :)

The actual guns may very but your numbers look good.

s>
 
yep when I change my spring I put the extended firing pin for that reason so far everything working great I even set up my back up shadow same way so there no difference between the two
 
Ok, thank you all for the info. A 13# main spring seems to be the consensus and leave everything else alone. Dlask sells the main spring in a combo package with a new firing pin spring. What does that do and is it necessary?
 
To add more into light primer strikes, use Federal SPP if you are reloading. Winchester SPP is my second choice. CCI SPP might be a little too hard for your stock Firing Pin. I have few FTF from a thousand rds of reloads with CCI SPP due to light primer strikes. A DA pull sets it to fire. Your SS guide rod looks sharp but I do not see any benefit except the fact that it will outlast your spring. I prefer the Poly Guide rod since it minimizes additional beating caused by the recoil. Cheap, and easy to replace. I have read of bent steel guide rod from other forums. Keep your SS guide rod until you can get the poly. Buy 2 or 3 polys. These will last you a while. While I prefer the solid look of the SS guiderod, I think poly is the better choice.

Stranger said:
You'll need a lower power recoil spring for 147 gr bullets at 130-132 power factor (or may be have some ejection issues). Usually 11# or 13#.
If you change main spring to 11# it may result in light primer strikes which can be cured by longer firing pin. All parts are factory available from CZ = Production friendly. :)

The actual guns may very but your numbers look good.

s>
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