New From Juggernaut Tactical: Ultimate AR Jig

Ultimate Jig

Though Juggernaut Tactical used to make one of the worst products I’ve ever reviewed, I still had a high opinion of the rest of their line. In what appears to be no exception to that, their new Ultimate AR Jig looks awesome. It’s a drill jig kit designed to help you turn an 80% AR-15 or AR-10 lower receiver into a 100% lower receiver . . .

On Brownells for $179.99, the basic kit comes with the following (from Juggernaut’s site):

• 17-4 Stainless Steel Drill Bushings
• Patented alignment tool with light
• Depth gage for quickly setting tool length
• CNC-machined from solid aerospace billet aluminum
• Laser-etched with Right/Left markings and drill hole sizes for convenience
• Individually replaceable plates
• Type III hard coat anodized
• If instructions are properly followed, the jig kit can be used to finish up to 25 lowers, or more

For an additional $60, one can add the Ultimate Jig Tooling Package. It “includes all bits required to finish your AR-15 or AR-10 lower. These are the same bits we use in our commercial CNC machines at the Juggernaut Tactical factory.” That includes:

• 1 ea. 0.375″ Cobalt Drill
• 1 ea. 0.3125″ Cobalt Drill
• 1 ea. 0.156″ Cobalt Drill
• 1 ea. 5/16″ Carbide Endmill

It looks like a really precise and solid way to finish out an 80% lower. But it’s a $180 wear-and-tear item that’s expected to last only through the creation of maybe 25 lowers, so that’s something to keep in mind.

Hopefully Juggernaut is or will be offering the ability to replace only the drill guides and bushings, which are the wear parts, as needed, while allowing the owner to retain the main body and other components. That would up the value and make the investment more appealing, especially over the long term.


  1. avatar Kroglikepie says:

    Can this be used to make g-g-g-ghost guns?!? Zoinks!

    1. avatar Geoff PR says:

      Every ‘ghost gun’ you build, Kevin de León bursts a capillary in his (Abby normal) brain, and *two* angels get their wings…

      *snicker* 😉

      1. avatar Kenneth G Maiden says:

        I like it when he pee’s his depends. Likely will be commie kalifornia’s next Senator. I have no trust in the brain stem only kalli voter block.

      2. avatar Jack Moore says:

        But does is have the ability with a .30 caliber clip to disperse with 30 bullets within half a second? Otherwise I don’t want one.

  2. avatar BIGBOIDC says:

    either this or the mini ghost machine.

    I do not trust my construction skills. I ruin ever thing

  3. avatar BLAMMO says:

    • If instructions are properly followed, the jig kit can be used to finish up to 25 lowers, or more

    WTF does that mean?

    I get confused with statements like this. Is it up to 25 (i.e., no more than) or is it more than? How many more than? I would think a jig can be used as many time as you want with no practical limit. If that’s the case, why imply there’s a limit?

    1. avatar Stereodude says:

      The drill bits will gradually wear the metal of the jig causing the holes to enlarge. Eventually, you’ll end up with lowers that are out of spec.

    2. avatar Keltex78 says:

      Up to 25 or more. A set inclusive of everything from zero to positive infinity. It might break the first time, or it may last forever.

    3. avatar Chris in SC says:

      The answer really depends on your equipment and your ability to align the fixture to said drill press. The runout of the drill press and chuck will eventually cause the drill bit to cut through the anodized layers in the holes. Once that layer is gone, any misalignment will cause the top and bottom anodized layers, and the now raw aluminum in the holes, to wear faster. This can be mitigated by using a mill/drill or a milling machine, but you wouldn’t need the fixture if you had one of those machines. There’s another company that makes a jig designed to use a trim router. It is much faster, but there is still plenty of opportunity for an unskilled user to destroy that as well.

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