This weekend I mounted a UTG top rail and my Vortex Venom onto my 535 and man was it a slick process. In total it probably took me 15 minutes and would've been quicker if my old man hadn't been distracting me. You guys gotta get one of these rigs. Easy installation, easy to get sighted in, and I think it improved my shot because it's high enough that the barrel doesn't fill my sight picture. I'd recommend it to anyone.