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Dimpling an AR-15 barrel

Discussion in 'Maintenance & Gunsmithing' started by Kain, Feb 4, 2011.

  1. Kain

    Kain Vancouver, WA Member

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    Hey guys and gals. I'm working on getting my AR exactly the way I want it, and part of that is getting a low profile gas block. Unfortunately, for a .625 barrel, it looks like all my options are going to be screw-secured.

    So, to keep my gas block from wiggling or twisting and futzing things up, I want to dimple my barrel. I see Rainier Arms has a tool to help with this, but its 40 bucks and I would prefer not to spend that kind of money on something I only use once.

    It is for this reason I come to you, friends. Can anyone guide me in the process of doing this myself without screwing things up? Alternatively, can anyone recommend a gunsmith in the Portland/Vancouver area who could do it for me, quick and painless?

    Thanks in advance for any help!

    Edit: in case it matters, I'm looking at the Larue low profile gas block in .625
     
    Last edited: Feb 4, 2011
  2. spengo

    spengo GLORIOUS CASCADIA Active Member

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  3. Capn Jack

    Capn Jack Wet-Stern Washington Bronze Supporter Bronze Supporter

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    Had a problem with a quad rail gas block moving around on a 7.62x39 AR.

    I took a center punch and ground 3/8" of the tip down to the diameter of the threaded
    hole in the gas blockand used it to reach through and mark the hole positions. Then I drilled the dimples into the barrel. Don't for get to Loc-Tite the screws.;)

    Jack :cool:
     
  4. madcratebuilder

    madcratebuilder Ardenwald, OR Well-Known Member

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    Go to Horrible Freight and buy a transfer punch. Align the gas block and mark with the punch, then drill your dimple in a drill press.

    28 Piece Transfer Punch Set
     
  5. Capn Jack

    Capn Jack Wet-Stern Washington Bronze Supporter Bronze Supporter

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    Hey Madcratebuilder,

    Great idea, I would has saved myself a lot of work with those and they're cheap too.:thumbup:

    Now to find a set of in expensive "Roll Pin Starter Punches"......Fat fingers and Bi-Focals are a PIA ;)

    Jack :cool:
     
  6. ruSSrt

    ruSSrt WA Member

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    This is simular to what I'm looking for but a little different. I have "raw" barrel for m16a1. That already has gas port drilled but it needs a front sight installed and as you guys know m16a1 front sight has tapered pins. So I was wondering if you guys know a person who can drill those.
    Thank you for your help!

    P.s. I'm willing to ship my barrel with sight if they do a good job!
     
  7. Ryo

    Ryo WA Member

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    For dimpling barrels, I would use marvin <nefariousarms@live.com>. He does a lot of custom dimpling jobs.
     
  8. Ryo

    Ryo WA Member

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    BTW how is dimpling suppose to help secure the gas block?
     
  9. wsu 5.9er

    wsu 5.9er Spanaway WA Member

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    You dimple the barrel where the set screws on the gas block contact the barrel. Keeps the gas block from moving around at all.
     
  10. Ryo

    Ryo WA Member

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    Ah, that type of dimpling.. Nevermind my previous post then. I was thinking dimpling of the whole barrel, not a single dimple.