postino;
Here're a couple that I think you've missed.
One of my favorites is the Mujahadeen AR project that was originally posted in segments here on ar15.com, [b]Building an 80% AR-15 Receiver With Only Hand Tools[/b]
[url]http://mujahadeenar15a2.tripod.com/[/url].
Another is a Canadian site entiteled [b]The AR-15 "Black Rifle" Project[/b] [url]http://www.angelfire.com/gundam/autoloader/[/url].
There's also some pretty useful info on OSI's savvysurvivor.com website at [url]http://www.savvysurvivor.com/gun%20pages/osi_drilling_fixtures.htm[/url].
Regarding the link to the Builders Squad site at concealcarry.org, please be aware that this is a [b]hijacked[/b] website and is not supported by me or anyone else in the Squad. They have been asked to take their site down, but to date, have not complied with the request. The "real" Builders Squad site at [url]quartz2.cyberstation.net/~dwpaul/bs-home.htm[/url] continues to be updated with new links and with new info as it becomes available.
All good . . . . Doug