I think the guide rod/spring on y SR 40 may be a bit too tight. It takes gorilla-like force to pull the slide back and I'm a big guy who's plenty strong. It seems harder than other SR 40s I have handled since my purchase and I get the occasional failure to eject which I believe is due to weak ammo ( ie a 'dud')not having the 'umph' to push the slide back I called Ruger after owning this gun for over a year to discuss. We went over everything I have tried, and without being asked they volunteered to send a new guide rod/spring assembly, no charge I don't need a lot of customer service on guns I have purchased. When I do, it is nice to know I purchased my firearm from somebody that gives a sh*t about keeping my business. I own the SR 40, SR22 and also a 10/22. Based on this experience, when I get around to getting a 1911 I expect it will be a Ruger!