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Juggernaut Tactical just introduced their new Ultimate Jig. There are tons of jigs out there for machining 80% lower receivers. For the most part all of them are specifically for either the AR-15 or AR-1o lowers and not both. The new Ultimate Jig sets itself apart by accommodating both AR-15 AND AR-1o lower receivers from not just Juggernaut Tactical but also most lowers available on the market. It also has Press Fit Stainless Steel Drill Bushings, an alignment tool to keep your lower in the perfect spot and a depth gauge for the drill bits. 

Juggernaut Tactical Ultimate 80 percent lower Machining Jig 1

After considering everybody’s feedback regarding jigs, we were able to develop our patent pending Ultimate Jig. With this jig, you are now able to build both AR-10 and AR-15 80% lowers. Our alignment tool that ensures the pocket is always centered in combination with our oversized top plates allows for very smooth and consistent finishing. Pair that with our press fit stainless steel drill bushings and included depth gauge, you will have yourself the perfect tool to finish any top-tier AR rifle. The only thing necessary to get your project going is a drill press or a hand drill and router; everything else provided in your Ultimate Jig Kit.

Juggernaut Tactical Ultimate 80 percent lower Machining Jig 1

– 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
– Optional high quality tooling package 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
– If instructions are properly followed, the jig kit can be used to finish up to 25 lowers, or more
– Made in the USA

Juggernaut Tactical Ultimate 80 percent bit set

Tooling package comes with:
– 1 ea. 0.375″ Cobalt Drill
– 1 ea. 0.3125″ Cobalt Drill
– 1 ea. 0.156″ Cobalt Drill
– 1 ea. 5/16″ Carbide Endmill

Overall this seems to be a very well thought out machining jig. The fact that it works for both AR-15 and AR-10 80% lowers is pretty awesome. Being that it works with both AR-15 and AR-10 lowers I was expecting to see a huge price tag on it but was very happy to see it is priced right in line or less than many of the comparable machining jigs on the market that only work with one or the other. If you’re an 80% DIY’er you definitely need to at least give the new Juggernaut Tactical Ultimate Jig a look.

The Ultimate Jig can be purchased directly from Juggernaut Tactical at

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