Good tool to have - Wheeler Fine Gunsmith Equipment AR 15 Receiver Lapping Tool

Simple and easy to use tool for those that take alittle more pride in their AR’s. Is it a necessity? Not really as you’ll never notice the difference especially if your rifle doesn’t see past 100yrds. Biggest thing is this will not work with thermal fit uppers. I’ve tried using in VLTOR and BCM uppers but the fit is way to tight to rotate plus they are pretty square from the start.