I put one on a couple of years ago, the gal sent me 2 of them for $10. I drilled it out and installed Tru-Glo rods to replace the dots, only had to file a tiny bit. Works fine.Here is a video showing how the SCCY CPX 1 or CPX2 sight fits onto the Keltec P-11. It's pretty easy to do. You don't need a sight pusher tool, and some Keltec slides may not require and fitting of the sight. The dimensions are almost perfect.