Replacement Parts for Universal AR -308, -15, -9 and AR-10 80% Lower Jig - Router Jig Extreme™


Please note that prices will vary depending on the replacement part required. Also, you can only add one part at a time to your cart. 

Confirm SpeedMill Type

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. ma-routerchart-website-01.jpg

*Satisfaction Guarantee

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!

Shipping Restrictions

We cannot ship this product to any states or major cities that have passed laws restricting these items such as California, Connecticut, Boulder or Denver, Colorado, Illinois, Maryland, New Jersey, New York, Rhode Island, Washington D.C. Laws change often, be sure to check what your State Laws and Local Ordinances are.