New England Custom Gun makes a really trick peep sight that attaches to the rear scope dovetail and (reportedly) holds zero when it is removed and replaced. Very nice as a backup sight or even as a primary. Let's face it, you're not going to be reaching across the coulee to swat deer with the 45-70...unless your coulee is particularly narrow.
Besides, when you scope a 45-70 you make Jesus cry.




























