3 Pack Cobalt Drill bit set for barrel installation

(5 reviews) Write a Review
Maximum Purchase:
5 units

3 pack cobalt drill bits for barrel assembly.

Includes a 3mm, 5/32, and your choice of 7mm or 17/64 for drilling all necessary holes. (front sight, rear sight, gas block, and barrel pin).

Some builders prefer to drill the barrel pin with a 17/64 and ream at 7mm.


  • 5
    3 pack cobalt drill bits

    Posted by Anthony Martin on Mar 18th 2021

    These are the best quality bits you could ask for and for the price you can't beat it .
    They are a must have for any hobbyist. Remember use oil an clean your tools they will last a long time .

  • 5
    Great Parts Kit for Price!

    Posted by VET on Jan 10th 2021

    Nice and sharp! Should work great on build!

  • 5
    3 cobalt drill bits for barrel installation

    Posted by jonathan p boyer on Oct 19th 2020

    Normally, I do barrel pin drilling with mill-end bits but wanted to give these a try. Heck, I was through the trunnion and into the barrel before I realized. Ditto for the front gas block. These bits are quality!

  • 5
    Get the job done

    Posted by Scott on Sep 21st 2020

    These work very well. Just go slow.

  • 5

    Posted by Bill Wazny on Jul 13th 2020

    I have not been able to use them as of yet. They look like they can handle it great. The tip looks real good.