Does what it’s supposed to - KAK .750 Multi Position Dimple Drill Jig

This tool does exactly what it’s supposed to, and that’s put a dimple perfectly opposite the gas port on a barrel. It does a good job of that and seems to be a well made part. However I prefer to square the gas block perfectly with the upper it’s going on. Using this tool there is still the potential for the block to be a hair off after installing the barrel, even when using a MI upper rod. This is probably an acceptable tolerance for plenty of people, and if you plan on selling the barrel or installing it on another upper later maybe you’d want the block aligned this way. Personally I install a barrel to go with an upper, and I like to perfectly square the block and upper together. I got this tool mostly to see how well I’ve done without one, and don’t find it necessary. I actually had to align the gas tube because it was pushing on one side from the block not being square with the upper. I like my gas tubes floating in the upper and interfacing perfectly with the gas key. Keep in mind that drilling nitride barrels can be very tough no matter what tool is used.