I am selling my Glock 23 .40 S&W with 20 rounds fired. I had a Laserlyte rear sight installed and it works very well. Check out the review at http://gunsmagazine.com/laserlytes-rear-sight-laser/ I am asking $575 for the package which includes the factory case, cleaning tools, extra mag, documents, etc. The laser alone is over $150 and a very practical tool especially for home defense. The size of the laser makes it almost unnoticeable when not in use and it fits all your existing leather.