Unlock the full potential of your custom firearm projects with our specialized .22LR AR-15 upper Group kit. Designed for enthusiasts and professionals alike, this kit provides the essential components needed to construct a high-performance, dedicated .22LR AR-15 upper. The package includes a precision engineered barrel collar, seamlessly replacing the standard chamber adapter on your .22 Cal AR conversion. This ensures optimal alignment and performance, enhancing the reliability and accuracy of your build. Whether you're upgrading an existing setup or starting from scratch, this kit offers the versatility and quality you need to achieve superior results. Perfect for target practice, training or recreational shooting, our .22LR AR-15 upper Group kit is your gateway to a customized shooting experience. 4140 chromium molybdenum steel Internal and external surfaces feature a salt bath nitride finish 1:16 twist rate .22LR sporting chamber Threaded - 1/2-28 muzzle