Easy Way to Dimple AR Barrels- EZ Accuracy’s Simple Dimple Tool

While I will contend that one never needs to dimple for a gas block, I will respect those who choose to do so. I believe in freedom and if you want an unneeded, unnecessary step added to the construction of your boomstick, who am I to judge?

For those looking to dimple their barrels, EZ Accuracy, a “full service gunsmith”, has created a nifty little tool to make dimpling a barrel easy, all without various expensive proprietary tools. Dubbed simply the “Gas Block Dimple Tool” (they really should rename it the “Simple Dimple”, but I digress), the GBDT is a hollow 10-32 set screw that threads into most gas blocks allowing for the simple marking and drilling of a dimple. 

To use, remove a screw from the gas block (keep the other one) and install the gas block with the one standard screw. Once installed, run the GBDT into the other location. Then, use the included marking pin to mark the spot and then prepare to drill using a standard drill press or optionally, run a 1/8″ drill bit directly through the center of the screw. If multiple dimples are required, repeat the steps above, just running in the set screw into the now dimpled barrel.

The GBDT runs a cool $14, which is a veritable bargain for such a good idea and easy tool. It can be picked up directly from EZ Accuracy’s website. 

Nathan S

One of TFB’s resident Jarheads, Nathan now works within the firearms industry. A consecutive Marine rifle and pistol expert, he enjoys local 3-gun, NFA, gunsmithing, MSR’s, & high-speed gear. Nathan has traveled to over 30 countries working with US DoD & foreign MoDs.

The above post is my opinion and does not reflect the views of any company or organization.


  • iksnilol

    Easier and better with a Dremel.


    • Vhyrus


      • iksnilol

        Just cut grooves in the barrel with a dremel, saves more weight than some pansy dimples.

        Take a shot or two of jack to calm your hands, to get it really neato and lined up.

        • Tinkerer

          Feh. Real men use hack saws. Rusty, dingy, banged up hack saws.

          • Jsim

            Nah real men don’t need no stinkin hack saw, they uses there teeth and bare hands

          • Tinkerer

            Nah, teeth and bare hands are for weaklings. Real men do their job with SHEER WILLPOWER! !!

          • Edeco

            Die grinders, rawr! Like a dremel but with more ass.

          • Phillip Cooper

            No, real men own the proper tools for the job.
            EDIT: and know how and when to use them.

        • Basil Sever Moulds

          Magdrill would do the trick pretty quick

  • J.T.

    I agree that you shouldn’t need to dimple for a gas block, because you shouldn’t be using a gas block that uses set screws instead of being drilled and pinned.

    • 99.9% of aftermarket gasblocks out there would disagree with you.

      • That does make it right. They are all made for the DIY AR15 crowd and not someone that relies on their gun for their life (not claiming to either).

        • Sam Damiano

          What is the failure rate comparison between pinned gas blocks and set screw gas blocks?

          • How many taper pin attached front sight/gas blocks have you heard of failing? Now as the same question about set screw secured ones. Remember the almost every repeating firearm since the beginning of WW2 has pin on blocks.

  • Gary Kirk

    Welllp… Reckon I done been doing alright with the 3 pound hammer and a center punch so far.. Don’ need no newfangled fancy tools work on mah AR zombie rifle

    • Jason Lewis

      Clean well. Red Loctite. Torque well. Done.

      • Gary Kirk

        That statement was a joke.. Disclaimer done.. If not using a gas block that is cross drilled and taper pinned, I prefer to use one that clamps onto the barrel. NOT one that uses set screws from the bottom to the barrel.. In most cases, the only reason people want a lower profile gas block is to fit an extended handgaurd, in which case I’ll just trim the A front sight down.. Sometimes this can’t be done, but in most of those cases, neither can the build anyway.. Not by me at least, I tend to value my freedom..

  • BrandonAKsALot

    I line it up and put one set screw at a time in and hit it with a transfer punch. Pull it off and dimple with a center drill. Then I stake each one twice. I’ve had too many threaded components walk even with loctite. Just had a strike foregrip come loose yesterday at the range. This is why AK’s have no screws/threads in important places that can walk.

  • Jason Lewis

    Never dimpled mine . Red Loctite and heavy torque. Tens of thousands of rounds and never a problem.