Jake Bowman is an exceptional manufacturer in the U.K. that offers a reasonably priced side lever conversion for the P15. It consists of a number of high quality 3D printed parts, an aluminum action bar and hardware. The instructions are clear and concise to allow someone with the most basic of mechanical aptitude to perform the work in well under an hour. I just outfitted one of my P15's with his kit and it is smooth, without any slop and no binding. My victim of choice was my .177 that is an exceptionally accurate freak of nature. I have a second kit that I will install on my .22. if you want your Artemis to look like something that costs twice as much, give his kit a shot.
Mark
Mark