Not quite understanding the questions, but here goes.
The Slide Stop is activated by the Spring Pressure on the Magazine Follower and it's Shelf, which presses up on the Slide Stop to Lock Back the Slide AFTER the last round has been fired.
No other Spring Pressure is needed to activate the Slide Stop. Note That the Slide Stop Retention Spring provides tension against the Flat on the end of the Slide Stop shaft to keep the Slide Stop from prematurely engaging the Slide under Recoil.
As for the Spring you speak of, which I believe to be the Sear Spring, it's short side will butt up against the Bottom of the Sear Cage to provide leverage while the longer part retains the Shaft of the Safety, and fits in the Groove on the Shaft of the Safety.
I hope that this answers your questions.
You may find the Videos below to be of some use.
https://youtu.be/TQ18jwe2QoY
https://youtu.be/2tf_jmfLzq0
https://youtu.be/MK7j3fD3H2Y
Hope this helps!
Hey thanks for getting back to me.. I'll try to explain tbis different.
The slide stop question... if you flip the slide stop upwards should there be any spring tension flipping it back down?
For example on a glock if you flip the slide stop up.. it shoots back down unless the slide physically grabs it because of the downward tension..
I'm assuming the witness/cz75 clones don't have any spring tension that would cause the slide stop to what to "boooyiing" and flip down.. lol
As it is now.. my slide stop only "deactivates" from manually action.. if you shoot the last round.. It locks back and you remove the mag.. if you where to pull the slide back a little further the slide stop doesn't drop.. it'll stay on alot of other pistols because of that downward spring tension on the slide stop if you where to pull the slide back a little it'll lose contact with the catch and the spring tension will drop the slide stop.. my sar arms/witness build doesn't do that and neither does the 45 witness P I'm building.
The safety on the witness has a spring that looks kinda like a detent type spring on the back side of the safety lever it's basically at the base of the pin where it comes out of the safety it gas no contact with the sear or sear cage it would be inside the wall of the frame if you compressed the spring somehow and pushed the safety on all the way. That's the spring I have no idea what it does or why it's there..
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There's the spring.. on the last build I did I used some sar arms parts the sar arms safety didn't have this spring.. I don't see what.it could do the.pyrpose or point of it..