Quote:
Originally Posted by ou1954
The length of the rod itself isn't a factor. What is needed is the length of the fully-collapsed assembly (When the spring is "stacked").
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Yes!
When the spring coils are fully compressed, any compression spring then behaves like a solid tube, or bushing.
You might be able to measure it fully compressed, by using the slide as a compression tool--guide rod base on firm surface, and pressing muzzle face of slide down onto rod, and measuring the fully compressed spring with calipers and your third hand.
AFA why this seems limited to SDVE40 and not 9mm...there's a few possibilities.
---Possibly, only one particular rate spring is problematical (e.g. 17# is ok, but 22# is not)
---The guide rod tabs *might* be robust enough to hold up under 9mm recoil, but not .40
---The spring sizing might be correct on 9mm version
---The spring sizing might have been correct on the .40 at one time, but S&W may have changed dimension(s) on the frame that the vendor failed to grasp and account for.
