This Ruger magazine extension attaches to Ruger BX-1 10 round rotary magazines turning them into the most fearsome of designs. Strike fear into the enemy with your tactical banana ready to make your 10/22 into the AK of your dreams. It fits standard 10/22, SR-22, Charger, American Rimfire, Ruger Precision Rimfire, and 77/22 rifles. 3D printed in the finest banana yellow filament and using the tried and tested mounting system of the BX-1 Magazine Coupler for reliable and secure fastening.