What else has to be done to complete the HPS receivers? Is the trigger area and rear lug area already milled so parts drop in? Will an upper fit on the lower? Thanks.
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Funny you should ask - I just finished another one with my mini mill. The following is a list of steps I wrote up before doing the first one so that I wouldn't have to "rethink" the whole process each time. I don't have tool sizes listed though, which would be helpful, but those are always available off the blueprints.
1) Mount drill chuck
- Drill pivot pin hole
- Drill remaining holes w/jig
- Drill bolt catch plunger hole
2) Mount 3/8 end mill holder
- Mill fire control area to final size
- Mill rear takedown pin relief
- Mill buttstock retainer hole
3) Mount 1/2 end mill holder
- Mill buffer hole to final size
4) Mount 3/8 end mill holder
- Tap buffer tube hole
5) Mount drill chuck
- Drill rear takedown detent hole
- Drill selector detent hole
- Drill pistol grip screw hole
- Tap pistol grip screw hole
- Drill pivot pin detent hole
- Drill pivot pin detent drain hole
- Drill bolt catch pin hole
- Drill buffer detent hole