As a shooter, you can now attach a handful of accessories to your firearm using Weaver T22 Base Pair Converter for 3/8" Grooved Receiver. This base pair can easily convert a 3/8-inch grooved receiver to accept other rings. This enables you to use a handful of scope mount configurations. Backed with Weaver's 80 years of experience, this base pair is the perfect option for adding to your rifle's versatility. The new base pair enables you to best utilize Weaver rings on your rifle by giving you a tight and secure fit. It is the ultimate in reliability.