* NOTE:  J & S Gun Parts cannot be held responsible for the fit, feed and or function of firearm(s) not fully assembled at the factory. As with any mechanical device, some fitting may be required. Some barrels may require headspacing depending on the combination of parts being used. If you are not an experienced gunsmith, do not attempt the assembly of any firearm without professional assistance. If you require technical assistance in assembling your PCR/AR kit, please feel free to call us at 360-888-7932. We will be happy to help.