I went to holosun 407c or 507c with rail mounts for our 'fun guns'. They are a little higher end but they mount low for natural alignment and they may never require a battery as they operate on solar and work without a battery installed, and run on solar whenever it's available as it draws in more power than the battery. The battery more for defensive/backup night time work as they are primarily used on pistols. You will add 3.0 oz to rifle with one of these on a rail mount, which go fine on a single standard low pro weaver mount that come on most rimfire. Our rimfires may not get used that often so not thinking about batteries is a thing for us. Spoiled with the Trijicon Accupoint 3-9x40 on hunting rifles...same thing, nice illuminated dot but no batteries to worry about or frustrate down the road.