Tacman, I have the 552. It takes AA batteries. I have had this site for 6-8 months & I'm still on the first batteries. No, it is a dedicated to my AR. I use a BC-CAM to co-witness the site. I'm trying to get geared up for 3-gun. I have not shot it yet though. There is a 3-gun match this weekend. This will be my first. I have been shooting IDPA for about 2 years now. I have shot the shotgun side match a time or two. I don't think you can go wrong with either Aimpoint or Eotech.