I was want to put a scope on my Marlin 1984C 357.mag lever action on a scout mount and my Ruger Redhawk 44mag 9.5 barrel, I also put a mount on my Rem 870 12ga combo, so any suggestions. I like BSA for the price and Illumated crosshairs are really cool in my opinion

I don't know to much about those scopes. I think what you ere looking for is called Extended Eye Relief scope. I know Burris makes one and Leupold makes a good one that Cabelas used to carry for about 200.00. I have never had a BSA scope. I have a Savage Scout rifle on layaway and will be getting one for it soon.

BSA brand scopes http://www.gunaccessories.com/BSAoptics/default.asp
In quailty it is like the new Tasco. I currently have a 3-10X "catseye" and a 2.5x 20mm "DeerHUNTER"
http://www.gunaccessories.com/AOSights/index.asp is the link for th AO mount and new sight for the Marlin 357mag 1984C. Quick turn handle rings are my next item to mount an extended eye relief scope.
http://www.gunaccessories.com/ is the homepage I found these links great site like this one.

I made an error I have a B square mout on my 870 20ga. not 12ga. shotgun combo. Does anyone know any benefits between a shotgun scope, pistol, and scout set up scope: such as specs. power, distance of eye relief needed, brand, added features.

Burris makes a Scout scope for the Scout mount. I have one in 2.75X.