For the first time ever, this revolutionary new tool allows you to easily clean and lubricate the upper receiver on AR-10 style rifles. This tool easily works with the interrupted cuts in the AR-10 receiver. The unique o-rings design of this jag holds onto the patch for the entire process, allowing you to scrub the action and remove burnt on built up gas residue. This tool is also excellent for applying lubricant to the action. This product has standard 5/16x27 threads that fit our new