OK, I think I got this uploading stuff down - Photobucket kept showing "upload failed", but when I checked, there the photos were.
The first photo shows the 80% lower as I finished milling and drilling holes. Note the pistol screw hole - Not sure what happened here, but the 3/8" drill went a tad over the 1.25" and didn't clean up with endmill. This view isn't cleaned up at all - just fresh off mill.
Next photo shows a side view of assembled lower. Still not cleaned up. I lost 3 or 4 detent pins and had to make new pins from brass rod I had on hand (just right size). Not sure how it happened, but I lost the green disconnector spring. I just happened to have a long compression spring that was right diameter, so cut off to length. I made a slave pin for the trigger/disconnector assembly. I had a .186" brass rod, so turned a short section on lathe and it sure makes assembly easier. Vent625, THANK YOU again for the parts, I would have been SOL without because some parts were missing from the rifle kit I ordered and your parts allowed me to finish assembly.
This shows completed rifle. Shoots good - Just got back from firing 4 rounds thru AR - 2 slow fires, and 2 fast fires. All worked smooth as a whistle - AND I FOUND ALL 4 BRASS!!! The 2nd slow fire I was watching brass rather than dirt bank and saw where it landed - right beside the 1st round. I'm happy - now to put some sights on it.
I think I still want a 300BO - I enjoy casting and reloading. .308 just seems to be a better caliber for casting bullets for, and will work better with light loads than will the 5.56 - is this true? I have just started powder coating cast bullets and they sure seem to work good.
Thanks again to all for info and comments.