The Advantage Arms Conversion Kit transforms your Glock 17/22 Gen 4 from 9mm/.40 S&W to .22LR caliber making range trips more affordable while maintaining muscle memory training. This California compliant kit features an optics-ready design with recessed cut for red dot sights.Advantage Arms MOD-CA Series Conversion KitCompatible with Glock 17/22 Gen 4 pistolsConverts 9mm/.40 S&W to .22LR caliberTwo 10-round magazines includedOptics ready with recessed red dot cutIncludes range bag for storage and transportCalifornia Legal and compliantPerfect for cost-effective training skill development and recreational shooting. Allows shooters to practice with their familiar Glock platform while using economical .22LR ammunition. Red dot optic sold separately.