Thought I'd share this as it is the first time I've ever approached Ruger customer service. I have an SR45 and the slide doesn't lock after I've fired the last round. From what I can see this is either due to weak magazine springs or a slide lock spring that is too stiff. I suggested that Ruger could send me either of these items and I could make my own repairs. Whether they'll go for this or make me send it in is still up in the air. Personally I'd like stiffer magazine springs as they feel light to me, I also have some feeding issues that I plan to deal with later, and I think stiffer springs could possibly help with this (however I have 7 magazines -I went a little overboard buying extra mags - so they might be more inclined to replacing the single slide lock spring instead). Will update as more develops.