what type of bases are on your rimfire? does it have the reciever drilled and tapped already for bases? reason i ask is, most of the red dots have the weaver style mounts already attached. if you have a grooved reciever, then you would need a mount that converts from grooved to a weaver style. i would think whatever one that you can see well would work just fine and i can't see spending a fortune on one for a rimfire.