I have a p30 with the lem trigger. I had a lighter trigger return spring installed. When I broke the pistol down to clean I pulled the slide stop all the way out. When I put it back in it broke my return spring. The armorer that installed the spring said I wasn't supposed to pull the slide stop all the way out , instead only partially. If this is true what keeps the slide stop secured? I almost did it again after the next session when I cleaned it . My usp always broke down with the complete removal of the slide stop. Can someone help?