If you mean a slick side (no fences) like the original M16 receivers, check Nodak Spud. If you're looking for thicker, I have no idea.
what machining capabilities do you have? How complete do you want it?
I have very little machining capabilities. I am a Millwright, not a machinist. I do have friends though. I would like it as complete as possible, or anything I could get. The most important thing is, the O.D. width of the magwell from the front of the receiver to the front of the trigger guard. I would like it to be 1.50 inches if possible? Like this.
Colt Model 602, 604, 605, 607, 608, 609, 610.
Pics link. Contact Us
It has been a while since I worked with this guy;
CNCGUNSMITHING - www.cncguns.com - Home of the AR45
His whole thing is CNC....
He can make you what you want...If he wants to....
This isn't for my own selfish pleasure. I'm trying to come up with a new idea to help our boys fighting overseas.
My friend has a CNC AR45 that guy has good quality parts.