These are sweet red dots for the price so I thought I would share. Bushnell TRS 1x25mm Red Dot 731303
If you really want to ring out the accuracy of that Marlin, you might want to look at a Vortex Crossfire II. It wouldn't run a whole lot more than the Bushnell red dot.Would one fit on my Marlin XT-22? That's the only rifle I have other than a shotgun.
I'd love to see the holster that would fit in.