Everything you need to convert your existing upper to a dedicated .22LR is included in this kit. Simply purchase a compatible magazine and you're ready-to start shooting. For optimal performance, it's recommended to use a round-style hammer to avoid function issues, as notched hammers can sometimes cause problems. Additionally, 36 grain plated nose bullets have consistently shown to deliver the best function and reliability. Enjoy hassle-free shooting with your .22LR conversion kit, perfect for enhancing versatility and cost-effective training.