Purchased one from Kel-tec and received it yesterday. When I try to install it on my P11, the screw holes are place too high up on the side of the shoe, so the end result is the screws only partially touch the trigger side and it keeps coming loose from my trigger when I try to tighten them down. Plus, the screws keep eating grooves into my trigger where I've attempted install it several times. I'm contemplating using crazy glue in addition to the side screws, but don't want to compromise my trigger too bad, so I'm a little reluctant to do this. The last shoe I purchased installed perfectly on a previous P11 I used to own, so I'm confused as to why this one is a problem. I'm wondering if anyone else has had a similar experience and taken a different route to secure the trigger shoe to the trigger.