AR15 80% Lower Milling Upright Jig for Drill Press

thingiverse

A friend asked me to create a support for them to make finishing AR15 80% lowers on their drill press easier. The method he was currently using was putting a vise block in the magwell (specifically designed for this) and then clamp it down in a milling vise. This worked ok for him, but he had to monitor his angles very closely to make sure something did not move. He asked me to design something for him that had a longer base and that could be bolted to the jig and the vise itself (not a clamping vise). He wanted to use his Proxxon vise (link below) so I designed this to be bolted to the clamping rails on that vise. This design is for the lowers with a removable trigger guard. I decided not to pre-create the holes, but instead you should carefully drill through them so you can push pins or screws in to better hold. This will tightly fit the lower. You may have to do a little rounding to the edges of the magwell portion depending on the cut of the lower. When using this, you will need to avoid excessive heat during the milling process (something you should do for 10+ other reasons anyhow) so that it does not warp due to the material. I will post another item shortly for mounting the Proxxon vise to a craftsman drill press (though it may work on others too). So, this jig will bolt to the vise, and the vise will bolt to the drill press, which should eliminate most play from the process. https://www.amazon.com/gp/product/B000S81MHY Edit I made these nearly a year ago and my buddy says he has made a number of lowers with them and that they are still working well! I am excited that these made things easier for him.