CZC 11# Recoil Spring

[emjei]

I noticed that the 11# recoil spring that comes in CZC Shadows is made with round wire and OEM is flat

1. Is there a reason for that ?
2. Is the CZC 11# measured as ISMI springs or Wolff ?
3. Will a Glock 17 uncaptured aftermarket 11# spring be used in a SP01???


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[1SOW]

I believe it's Wolff springs.
I don't know the "length/wire and coil  diameter" for the glock springs
All the Shadow/standard 75  Custom Shop springs are round-wire and were made by Wolff unless that's changed.
Wolf and CGW also sell springs/spring packs (round-wire springs) made to their specs  for wire diameter, length vs weight.

These springs are relatively cheap, especially in one of the various spring packs from either source.  (<$7 each).

[emjei]

Wolff springs as far a I read in another forum runs heavier than ISMI....therefore Wolff 11# is then 12# ISMI


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[1SOW]

A forum member, quite a while back,  gave a method to measure spring weights for CZs.  He was talking about those misc. springs that wind up in a box and you don't know the weights.    I tried it and it seemed to work pretty well:

Mount a post/dowell on a board.  Put the czpring on the dowell.   Drill a hole  in piece of wood to fit loosely over the dowell but still rest on the spring.  Add weight on the board until the spring length is compressed to the same length  as when the slide is "all" the way back in the pistol .
Measure the weight of the board & weights to get the spring compressed to that length, and it should equal the spring weight FOR THAT PISTOL. 

Another pistol may have more or less compression when the slide is fully back,  so the same spring could provide a different weight in different pistols with the slide back.

I'm no physics or pistol expert,  but this seemed reasonable;  and my tests seemed to agree with the method +/- a half pound or so.  I attributed that to imprecise scale I was using.