Got to me in just a few days. Fits perfect on my g19 slide milled to the holosun K/rmsc footprint. I almost went with the Osight SE until they came out with this much more comparably priced closed emitter option from a more trusted brand with a couple more features than the SE. The full window size of the eps with the footprint of the carry was also great idea. So far the front facing auto-brightness seems to work a lot better than other holosun optics, and there is a secret setting not mentioned in the manual that allows you to "tune" the autobrightness to lean more bright, medium, or low. Just click up or down while in autobrightness mode. Very useful, hope they keep honing in the autobrightness.