The Router Jig Extreme™ tool kit contains our custom designed SpeedMill™ and all drill bits you need to complete your 80% lower receiver build.
We strongly recommend all customers to only use our proprietary end mill, the Modulus Arms SpeedMill™ with our 80 lower jig.
Please see the chart below for which routers we recommend to use with our corresponding SpeedMill™ versions (there are 4). You can also pick up a Tool Kit if you want spare tools.
If your router is not on any of the lists, then it is not compatible with our products and we do not recommend using it to complete an 80 lower with Router Jig Extreme™. Please note that all routers that use V4 will need the Large Router Plate.
Our products are protected by multiple issued and pending US Patents.
It’s possible that some, very rare and oddly shaped non-milspec AR designs will not fit this jig. In the unlikely event that your 80 lower doesn’t fit you may return the jig for a full refund or consider buying one of our 80% lower receivers instead!