AR-15 80% Lower Receiver And Jig Kit - Polymer80

Milled mine using a Smithy, did really good. Instructions available for print out (which I did ) were not very descriptive in some critical areas, better safe than sorry. Even if you have to go back and re-mill it's better than scrapping your lower.

Used a Wen 8 inch drill press and a little extra work to make it work. had to remove table and bolted he cross vise to the stand via a couple of 1/2 inch plastic cutting boards to get the correct height and offset the head to make room between the post and vise. Milling went well (take your time) use the jig as a guide. Use patience and skill to do the work. only problem encountered while building was the buffer retainer hole is a bit to small for the detent had to ream to 6.5mm (1/4). the use of a 10 inch drill press would have made things a lot more strait fwd.

I had never tried milling before and the video makes it look easy. I bought the wrong drill press to start with...it was a 10" WEN bench mount press. Once I added an X-Y vise the vertical working space was greatly reduced.. After installing it into the chuck the milling bit hung about 1" lower than the top of the jig. I tried to outsmart it by inverting the press table and I gained 1.5", but no matter how I tried to shim it using a torpedo level the X-Y vise would not level in both directions on the uneven surface. I then resorted to adjusting the jig by raising it about 1/8" in the rear as near as to true bubble as I could get it and then tightened the vise very hard. I started milling and it went well, but raising the jig in the vise didn't work out and I broke through the floor of the fire control group pocket. What part I did get done looked really good with smooth sides and smooth at the bottom of the pocket...until I broke through. I got discouraged at that point and rather than buy another drill press I purchased a pre-milled lower at the local gun shop. However, I do firmly believe that if I had the correct height drill press I could have accomplished the task and milled the pocket properly. The milling part was not as hard as I first thought so my difficulty was in my initial setup not being attainable with the press I bought...I wish I still had my old Sears floor mount press and it would not have been a problem. So, my suggestion for the first timer is make sure you have the correct equipment with plenty of height adjustment to compensate for the vise.