Well made product - Wheeler Fine Gunsmith Equipment Delta Series Variant Receiver Lapping Tool AR LR/10

Excellent tool and very easy to use. Lapping can be done without using the drill adapter. You only need to remove a few millimeters to square the barrel mating surface. The only issue is the package had been opened and everything was rattling around in the box. Doesn’t appear to be damaged. -2 stars for selling an open package.