Spike's Tactical is pleased to offer Black Dog Machine X-Form 25-round Mags with Last round bolt hold open followers for Dedicated .22LR uppers and .22LR Conversions. These 25-round magazines are manufactured proudly here in the U.S.A. by Black Dog Machine, LLC and are what we recommend for use in .22LR conversion kits and dedicated uppers. They are easy to disassemble for cleaning and provide highly reliable feeding in both semi-auto and full automatic. They are injection molded from high-impact polycarbonate to stand up to abuse and to prolong the life of the magazine. Check local laws for magazine capacity restrictions.