The slide stop lever assembly/feature can be useful for more than one thing.
In armorer classes it's commonly taught that a bench check of magazine spring's tension is to take the EMPTY gun and each EMPTY magazine, insert the magazine into the grip with the slide forward, and then manually run the slide to the rear as fast as humanly possible. If the slide doesn't catch and lock back on the empty magazine, the usual suspect is a magazine spring approaching the end of its useful service life.
Away from the bench, meaning out on the firing line, the failure of the magazine spring to lock back the slide on an empty magazine is often an early sign of a weakening magazine spring. The 'next sign' can be feeding failures, usually toward the end of the magazine load (when the spring is at its least compressed state), as the spring can't keep up with the slide and keep the round stack pushed up quickly enough to feed the next round.
If nothing else, having a slide stop lever can be helpful in diagnosing some issues.
However, in the inevitable tradition of TANSTAAFL, the slide stop lever (which is an assembly in some pistols) can also introduce some issues if it becomes damaged, worn, etc.
I enjoy having the slide stop feature on all of my pistols ... but I don't mind my LCP's not having it. The pistol is just so small that it's hard enough to manipulate the lever manually, to lock it open. Besides, I treat my LCP's like I treat my J-frames, in the regard the I know I have a very limited number of rounds available before I'll need to reload.
Comes to that, since I carried a 6-shot service revolver on-duty and a Colt Commander off-duty (7rd mags in those days), I accepted that firing even a few rounds would come close to running things dry, and I acted accordingly.
In armorer classes it's commonly taught that a bench check of magazine spring's tension is to take the EMPTY gun and each EMPTY magazine, insert the magazine into the grip with the slide forward, and then manually run the slide to the rear as fast as humanly possible. If the slide doesn't catch and lock back on the empty magazine, the usual suspect is a magazine spring approaching the end of its useful service life.
Away from the bench, meaning out on the firing line, the failure of the magazine spring to lock back the slide on an empty magazine is often an early sign of a weakening magazine spring. The 'next sign' can be feeding failures, usually toward the end of the magazine load (when the spring is at its least compressed state), as the spring can't keep up with the slide and keep the round stack pushed up quickly enough to feed the next round.
If nothing else, having a slide stop lever can be helpful in diagnosing some issues.

However, in the inevitable tradition of TANSTAAFL, the slide stop lever (which is an assembly in some pistols) can also introduce some issues if it becomes damaged, worn, etc.
I enjoy having the slide stop feature on all of my pistols ... but I don't mind my LCP's not having it. The pistol is just so small that it's hard enough to manipulate the lever manually, to lock it open. Besides, I treat my LCP's like I treat my J-frames, in the regard the I know I have a very limited number of rounds available before I'll need to reload.
Comes to that, since I carried a 6-shot service revolver on-duty and a Colt Commander off-duty (7rd mags in those days), I accepted that firing even a few rounds would come close to running things dry, and I acted accordingly.
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