Midway has a whole bunch. Look under B-square or search 11mm dovetail or airgun rings. I think they are scamming a bit as I bought the B-square airgun mounts for 22 or airguns made of aircraft aluminum and the identical looking 22 only ring mounts are like 20-30 dollars more. I have had no problems with the "airgun mounts". Do a similar search at Brownells and you should get more results and you can also get weaver adapters so you can use plain old weaver mounts. Also look up Eric Brooks and get his trigger kit, single best thing you can do for your gun. also you didn't say what caliber is your gun as I think .17 HMR are 3/8" and the .22 are 11mm. hope it helps.