I replaced several components on this pistol - the guide rod and spring are from Cajun Gunworks, I did a single action conversion on this gun with a Cajun Gunworks trigger, I replaced the hammer and sear with a Cajun Gunworks set, I also had Cajun Gunworks mill the slide for this Holosun HS507k as well as the slide cuts in the front. This is a fantastic pistol and comes with 2 high capacity magazines.