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80 percent AR15 Lower receiver jig
In Stock, Price Includes Shipping: 80 percent AR15 Lower Receiver Jig

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Description Technical Specs Extended Information
Out of Stock, Price Includes Shipping : Jig is use to finish your AR15 80 percent Lower Receiver. Includes both Milling plates, Drill Press Plate and needed drill bits made in U.S.A.

Part’s Included:

1 –Steel Milling Plate 1
1 – Steel Milling Plate 2
1 – Steel Drill Press Plate

4 – 10-24 x 1/2 Bolts
1 – ¼” – 20 x 1 3/4 Bolt
1 – ¼” – 20 x 1 1/2 Bolt

1- 3/8” Drill Bit
1 - 31/64" Drill Bit
1 – 5/16″ Drill Bit

1 – 5/32 Drill Bit

1 – 1/8” Drill Bit


This the jig that I like to use to finish my 80 percent lowers. The steel mill plates are thinner then the aluminum mill plates and you can see your lower better as you start your work. Also if your machining skills slip and you start to go off course and run into the mill plate, you can hear the steel plates chatter loud and clear. With the aluminum mill plates the sound doesn’t change. Use included shims for large built-in trigger guards.

To install the jig on your 80% lower, install the side plates of the jig first on your lower. Leave the side plates a little loose and install the top plate you are going use, i.e. drill plate, mill plate. Tighten the top plate and then side plates.

I like to drill the trigger pin and safety holes on the 80 percent lower receiver after I finish drilling or milling the magazine well and safety pocket. This leaves very little material to drill though to deflect the drill bit off center.

For 80 percent lower receivers that are not anodized, one product that you can use is Brownells Aluma-Hyde II for your finish. We found this product to be surprisingly tough and easy to use. The only drawback is the curing time, 14 days. Brownells website has instruction videos on using Aluma-Hyde and other like Cerakote.

I am frequently asked if you can actually finish an 80 percent lower receiver with a drill press. Yes you can, but be aware, however, this method is extremely labor intensive. After you are finished drilling out the magazine, safety and rear takedown pin cavity, you must use a file to finish the AR15 80 percent lower which is labor-intensive. The mill plates can be used as guides for your hand forming (filing) of 80percent lower receiver cavities.

If you have a Drill Press with a sturdy spindle, you can use an End Mill bit to finish your lower. You will need a Drill Press Milling Vice which you can get at Harbor Freight, You can also get an End Mill at, 3/8” is the most popular. I would use the drill bits to remove most of the material then finish with the end mill.

You Must Legally be allowed to possess a firearm.

If you live in CA, you need to be careful to follow the laws related to the Assault Weapons Ban. In general, if you build AR-15 style rifle with a pistol grip, you will need a "bullet button". There are configurations that do not require a bullet button. For more info on following CA Laws, has a very helpful flowchart:

Lower Receiver Jig Instructions
Milling 80% Lower with Drill Press

  • AR15 lower receiver jig

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