AR-15 80% Lower Universal Jig Kit

Jig Options

If you already have our Universal Jig and want to purchase only the tooling packing, click here for our Universal Jig Tooling Package.

Now that you have made the wise decision to purchase the Juggernaut Tactical AR-15 80% Lower Receiver, you will need to finish the machining procedure. This high-quality 80% lower jig kit makes that part of your rifle build project easy. All you need is a drill press or a mill.

This 80% lower jig kit can be used on both forged and billet AR-15 80% lower receivers using the new indexing technique, which utilizes the buffer tube mount to center the receiver (not the sides).

  • Can be used on both forged and billet AR-15 80% lower receivers
  • New indexing technique uses the buffer tube mount to center the receiver (not the sides)
  • CNC-machined from solid aerospace T6 heat-treated 6061 billet aluminum
  • Laser-etched with Right/Left markings and drill hole sizes for convenience
  • Individually replaceable plates
  • Type III hard coat anodized
  • Optional high-quality tooling package includes all bits required to finish your JT-15 lower. These are the same bits we use in our commercial CNC machines at the Juggernaut Tactical factory
  • If instructions are properly followed, the jig kit can be used to finish up to 25 lowers, or more
  • Made in the USA

Tooling package comes with:

  • 1 ea. 0.484" Cobalt Drill
  • 1 ea. 0.375" Cobalt Drill
  • 1 ea. 0.156" Cobalt Drill
  • 2 ea. 0.125" Cobalt Drill
  • 1 ea. 3/8" Carbide Endmill
  • 1 ea. 1/4" Carbide Endmill

Click here for step-by-step video instructions on finishing your AR-15 80% Lower with our 80% lower jig kit.

Note: Our jigs are not compatible with billet lowers from 80% Arms or 5D Tactical, as they are not mil-spec on the outer dimensions.

Note: Due to ATF final rule 2021R-05F (more info here), you cannot order an 80% Lower and jig-related products at the same time. If you have both in your cart, you will not be able to complete the checkout process.

Recent reviews

5 out of 5 stars

Great Product!

Jig kit is simple to use and made of good quality materials.

Dan S.

February 15, 2024

5 out of 5 stars

Well built, easy to use!!!

The most important thing is to watch the video on their website because it breaks the process down step by step. If you do that then there are no problems ( unless you have no machining experience) but even if that is the case just pay extra attention to the video. You will need calipers as well.

Kris S.

February 14, 2024

5 out of 5 stars

Ar 15 milling jig

Works perfectly ,it may help if the drills had a hexagon shank,other than that ,its nearly fool proof, glad I got it!!!

James W.

February 10, 2024

5 out of 5 stars

universal AR-15 Lower Universal Jig Kit

This lower jig works better than expected. i would recommend this lower jig to anyone that is needing one for a 80% lower

james c.

February 9, 2024

5 out of 5 stars

love it

It was easy to use, I watched the video a few times to make sure I did everything right, and it came out beautiful.

christopher d.

February 8, 2024

4 out of 5 stars


I really like this jig and enjoy using it. It's pretty straight forward to use for a first time builder like myself. I think they should update there instructions because it gave me a link to watch a video on you tube that wasn't there and had to email them to find out how to do the process of milling out the lower.


February 8, 2024

5 out of 5 stars

It worked great

The jig kit and tools seem to be good quality and made finishing my lower quick and easy.

Christopher C.

February 6, 2024