Make sure to read a description of the 507K-X2 to make sure it's compatible with your firearm... This optic is barely used. Has only 10 or so shots through it. There is a small blemish on the bottom front edge of the optic from coming into contact with the slide of my P365. But you wont even see the blem when the optic is mounted... Otherwise this optic is pristine. Holosuns' are quite amazing for the price. You won't be disappointed. These go for 300 MSRP. I am asking for 215 cash because of the blem.