Burris standard rings are interchangeable with Browning, Millett, Redfield and Leupold components. All standard and deluxe rings are precision machined and hand polished to high quality specifications. Their .22 rings fit 3/8" grooved receivers.Burris rimfire and airgun rings are the highest quality available. They are known in the industry for reliable performance under any conditions. Features: Fits 22 grooved receivers Use with Rimfire and airgun optics Durable, with strong gripping power Time-tested, proven design Covered by the unconditional Burris forever warranty