Been having some trouble with my magazine release,it is very stiff on my 5.25. So being an engineer I decided to take it apart to see what the problem is, thinking there was a burr on one of the components. Well as it turns out there was not and I think it is just how stiff that spring is. And speaking. Of that spring, it is damn near impossible to get back it. I spent nearly 3 hours trying to put it back together. I finally got it, but I don't think I will ever take that apart again.