I have an original Ruger .44 magnum carbine, the Deerstalker. It loads via a tubular magazine in the forestock, and does not use the rotary mag that later models did. I've gotta admit that it's been sorta ignored lately, and I thought I'd put it to more use this summer. As part of that process, I was thinking of putting a red dot sight on it, but am not as up on modern optics as I should be, so am looking for suggestions on a decent little red dot sight that won't break the bank. Recommendations?