Hay shootem up 870
It looks like no one wants to give you any advice. Well, I have a Bushnell 4 x on my Marlin model 81TS 22. I have hunted with it for several years now and not one problem. It has been out in the rain and hot weather also. It is very affordable. You can buy a more expensive scope but I just wanted you to know about the Bushnell. It works.
http://www.bushnell.com/products/rif...cs/76-2243.cfm
Hornet Man