Home AR-15 AR-15 80% Lower Universal Jig Kit

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 jig

I am new to the building seen. At this point I have used 2 different jigs and there is no comparison that the juggernaut jig is the best, and so easy to use. I definitely recommend the product.


June 11, 2024

5 out of 5 stars

Great jig kit

This lower jig kit is so easy to use I have to watch what I’m doing though because u can mess any of the top plates up I have done 40 or so lowers with this jig and could do a 5 or 6 more with it Really a great jig for the price!!!!


May 20, 2024

5 out of 5 stars

Great Jig

Great jig, easy to use. Fun and therapeutic! Do it!!

Brandon D.

May 3, 2024

5 out of 5 stars


It doesn't fit side to side like it should . If you over tighten the rear bolt it wants to taper out at the other end. I had to be very careful not to bend it. Other wise it worked pretty good. The bottom could use some spacers to help from over tightening. The hole locations for the hammer, trigger and safety were very accurate. I know that Lower widths can vary .010 - .020. I think the side plates should be able to handle some spacers at a particular width. Anodized finish was nice and thick and helped to protect hole accuracy. I'm a tool and die / tool maker and I had almost made my own. Bought yours instead

Philip W.

May 1, 2024

5 out of 5 stars

Great product

Well made. Exact measurements

Ron P.

April 22, 2024

5 out of 5 stars

Ar kit

Easy to set up and use

Robert M.

March 21, 2024

5 out of 5 stars

Universal Jig

Easy to understand and use. Was able to do 5 lowers without wearing any of the top plates.

Luther B.

March 16, 2024

5 out of 5 stars

superb product

very nice product very user friendly and of good quality. had absolutely zero problems using this product. keep up the good work

Sean M.

March 8, 2024

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