Well made riser / adapter - B-Square Air Gun Adapters & Risers - 3/8" to "Weaver" Adapter (2-piece base), Blue 17025

Wow, these risers worked perfectly, stepped up the 3/8" rail on a Geco .22 Training Rifle to allow for the mounting of a 3-9x50 scope. Now the scope sets at a comfortable height allowing the bolt to work properly. I would recommend this product to anyone looking to use their weaver scope rings on a 22 rifle.