I lost the ejector for my P3AT and ordered one from Keltec. I called them, told them what I needed and gave them my gun's serial number. They sent me an ejector immediately and din't charge me (Great CS!). I installed the new ejector today and it drops in fine but the slide binds on it horribly. I can't even rack the slide past it. I assume that there are some generational differences with this part so which one did I most likely get and which one do I need? Could I file this one down? Thanks in advance.