Hi Jamesfrom180,
Welcome aboard. Optics for air rifles are just about anything you want. If you go with a scope, you either need an air rifle that does not recoil (non-spring powered) or a scope that is rated for use on a spring powered air rifle. I'm using a Leapers 3 - 9 x 32 on my Beeman. Sorry I am not familiar with the marauder.