Router Jig Extreme™ Tool Kit w/SpeedMill™

Usually ships within 24hrs. M-F

The Router Jig Extreme™ tool kit contains our custom designed SpeedMill™ and all drill bits you need to complete your 80% lower receiver build.

Kit Includes:

  • 3/8 Drill Bit.
  • 21/64 drill Bit - custom designed for deep hole drilling and chip clearance.
  • 5/32 drill bit.
  • Custom SpeedMill™ - You must select proper SpeedMill™ to correspond with associated router. (see table below)
  • Made in USA.


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

BOSCH PR10E SpeedMill #1
BOSCH PR20EV SpeedMill #1
DEWALT DWE6000 SpeedMill #1
PORTER CABLE 6430 SpeedMill #1
PORTER CABLE 6435 SpeedMill #1
RIGID R24012 SpeedMill #1
CRAFTSMAN 28212 SpeedMill #2
DEWALT DWP611 SpeedMill #2
PORTER CABLE 450 SpeedMill #2
MAKITA RT0701C SpeedMill #3
CRAFTSMAN 2767 SpeedMill #4
CRAFTSMAN 27683 SpeedMill #4
CRAFTSMAN 50429 SpeedMill #4
DEWALT DW616 SpeedMill #4
HITACHI M12VC SpeedMill #4


If you have a router not listed, you can reference the below sizing and thread pitch, and see which would match up with your routers spindle. It can be tricky to get these measurements, and for more information on collecting the info, you can visit:


Spindle Diameter Tool Size Thread & Pitch
0.55” / 13.9 mm 1 M14 x 1
0.59” / 15 mm 2 M15 x 1
0.66” / 16.8 mm 3 M17 x 1
0.78” / 19.9 mm 4 M20 x 1




Router Jig Extreme™ Satisfaction Guarantee Policy: Satisfaction is guaranteed. We are completely confident that you will love the Router Jig Extreme™. If for any reason you are not satisfied with it, you may return the Router Jig Extreme™ for a full refund minus shipping costs within 30 days. Just contact our customer service team for a return authorization and be sure to save the original packaging. All pieces must be returned in good condition with original packaging. Lifetime Replacement Warranty: Modulus Arms 80% lowers are nearly indestructible and are covered by our unconditional lifetime replacement warranty. If you somehow manage to destroy a Modulus Arms 80% lower in a way that stops it from working properly, we will replace your lower with a new one free of charge. Damage caused by milling your 80% lower out incorrectly and intentionally inflicted damage is not covered. Return policy: Modulus Arms products may be returned within 30 days for a refund as long as they are in unused condition. Products which are not made by Modulus Arms such as magazines, lower parts kits, etc. are all returnable within 7 days as long as the original packaging is unopened.