A must have tool!
If you are buying barrels that don't already having the dimpling in place, this tool is a must have when using gas blocks anchored by set screws. It works so well! Easy and simple to follow directions and the tool covers the two most common set screw spacings. Just make sure to follow the directions as you should do and place it on the barrel correctly, don't wing it. Buy a brand new drill bit and designate it solely for this tool and purpose, keeping it with the tool so you have the drill bit every time you need it. Also don't try to drill the depth in one pass. Get the feel for the tool, the pressure needed to penetrate the barrel, and check to see your progress by removing the drill guide and cleaning it out after each time, checking to see how much progress has been made. By doing this you will not go too deep and will get it just how you want it. I took my time and had great results. This tool is a BARGAIN - get one!
Reviewed by: Brad from Puyallup, WA on 6/11/2016