The Midwest Industries MI308URR is an upper receiver rod specifically designed for .308. It is compatible with both LR308 and AR308 barrels and receivers. This tool shines in situations where barrel nuts prove to be stubborn or seized, allowing removal without causing any damage to the upper.Its versatility extends to assisting with muzzle device installations and even the installation of forward assist/port door covers. Another key attribute of this robust tool is its flexibility in installation. The MI308URR can be mounted either horizontally or vertically in a bench vise. To top it all off, it is proudly made in the USA.