Builders Bundle + (5) 80% Lower Receivers (Billet)


Our Package Includes: 


The new Modulus Arms Router Jig Extreme™ is the fastest to use, highest quality, most universal 80% lower jig on the market. Don’t just take our word for it, see for yourself risk-free with our 100% money back satisfaction guarantee*. If you don't love our jig, we will give you a full refund!
The Router Jig Extreme™ comes in one fully universal model that fits all AR-15, DPMS style .308, and AR-9 lowers. There is no need to buy any extra add-on parts for .308 compatibility. The standard model is fully universal right out of the box. Modulus Arms invented the first fully universal router jig, and we’ve once again raised the bar.
caution-icon.png The SpeedMill™ is required for use with the Modulus Arms Router Jig Extreme™ and is included in this Builders Bundle. Previous generation Modulus Arms end mills will not work with this jig for your 80 lower build. caution-icon.png
    • The fastest 80% Lower jig on the market, capable of finishing an AR-15 80% lower in a record setting sub-45 minute time.
    • Switch between AR-15, AR-9, AR-45 or .308 lowers in seconds.
    • All wear surfaces are made with hardened steel.
    • Our router attachment plate uses a proprietary one piece solid guide pin system to trace fire control group pocket profile guides, ensuring the end mill never touches the jig. This eliminates wear - extending the life of your 80 lower Router Jig Extreme™.
    • The Router Jig Extreme™ utilizes a heat fit (a.k.a. shrink-fit) end mill holder which provides increased rigidity over a standard length carbide end mill.
    • 1.5 in thick no-touch side plates keep your drill bit stable when drilling with a hand drill.
    • Only 1 hole needs to be drilled before milling.
    • Patented integrated depth gauges tell you how deep to mill and eliminate the need for any measuring.
    • Patented integrated vacuum attachment allows you to attach a standard vacuum hose, greatly reducing the mess created by chips.
    • Easy to follow illustrated instruction booklet included. 
  • Shipping Restrictions: This item is restricted from shipping to New Jersey, New York, Hawaii, Connecticut, Rhode Island, Washington D.C., Maryland, Illinois, Los Angeles, Oakland City, San Francisco, San Diego County, Boulder Colorado, and Denver Colorado.

Please check this table to confirm your correct Router and the appropriate SpeedMill™:

BOSCH PR10E SpeedMill #V1
BOSCH PR20EV SpeedMill #V1
DEWALT DWE6000 SpeedMill #V1
PORTER CABLE 6430 SpeedMill #V1
PORTER CABLE 6435 SpeedMill #V1
RIGID R24012 SpeedMill #V1
CRAFTSMAN 28212 SpeedMill #V2
DEWALT DWP611 SpeedMill #V2
PORTER CABLE 450 SpeedMill #V2
MAKITA RT0701C SpeedMill #V3
CRAFTSMAN 2767 SpeedMill #V4
CRAFTSMAN 27683 SpeedMill #V4
CRAFTSMAN 50429 SpeedMill #V4
DEWALT DW616 SpeedMill #V4
HITACHI M12VC SpeedMill #V4


The Router Jig Extreme™ is the only jig in the world backed by a 100% satisfaction guarantee. If you don’t love this jig, send it back for a full refund.*
Protected by multiple issued and pending US Patents.
It is possible that some very rare, oddly shaped non-MilSpec designs won’t fit. In the unlikely event your lower doesn’t fit, you may return the jig for a full refund.