Yes. When removing or installing the slide stop lever, which doubles as the takedown lever, it seems to be critical that pressure (of the pushing or pulling variety) on the left side be placed only on the point where the two main portions of the part come together. One portion is perpendicular and extends through the elongated hole in the barrel locking lug, which can be called the "pin." The other portion is flatter and extends along the side of the pistol, to serve as the slide stop lever actuation point, which can be called the "bar." Where the pin and bar meet is the point at which all pressure should be applied. If you apply pressure (again, of the pushing or pulling variety) elsewhere, such as along the bar, there seems to be a possibility that it will bend, and go out of spec.
There is a way to check whether your slide stop lever is out of spec. With the Sig Pro assembled, apply slight inward pressure on the rear of the slide stop lever. Is there some play? There should be no inward/outward play. There can be downward play, of course, as that's how the slide stop lever functions. When there is inward/outward play, it seems that the pin can work itself loose. If this is the case, you will need a new slide stop lever. Call SIGARMS (603-772-2302) to explain the problem, and request that they send to you a new slide stop lever.
Why does this happen? The Sig Pro is rather tight from the factory, in terms of the pin of the slide stop lever. The first couple times that you field strip it may be tough. When things are tough, humans are prone to use leverage, to either remove or install, such parts. Applying leverage to this part will eventually cause it to bend. I suggest that you spend a few minutes to carefully fieldstrip your new Sig Pro, several times, in order to become familiar with how to fieldstrip it so that you can learn to fieldstrip it with ease.
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