I've been assembling ARs since 1982, almost always used a factory installed FSB-barrel assembly. The modern type rifle uses a low profile gas block, and a dimpling tool is required for a real quality build. Sure, I have some that aren't dimpled and never moved for 10k+ rounds. But the dimple tool ensures near perfect alignment, and greatly increases the chances the gas block will stay in place. This is a quality tool that is very easy to use and understand, at a ridiculous price. Buy with confidence.
Mar 25th 2017
5Mar 25th 2017
Beyond impressive!
Wow! Better than the BRD (Black Rifle Disease) dimpling jig! Definitely gonna get the others so I have all sizes to do this to any barrel! At this price point you cannot go wrong! I've seen it done by eyeballing and by using a gas block to drill the dimples and if you are comfortable taking that risk with a barrel... Go for it! But I'd you want the best in guaranteed "gonna work" gas block setting then get this!
Also, shipping was as fast as Primary Arms! And if you buy parts then you know PA! This is saying a lot for RTB!
Mar 1st 2017
4Mar 1st 2017
Very good
i was impressed with the quality and workmanship of the jig. It far exceeded my expectations.
Sep 9th 2016
5Sep 9th 2016
just what I needed
I have always just eye balled the gas block and shot some air through it to make sure the gas port is lined up and I have got away with that but then I discovered this tool. Now I can be sure it is properly aligned.
Stock Status: 
