http://www.gunbroker.com/Auction/ViewItem.aspx?Item=358827731 I'm looking to make some receivers. The link above is the one I have in mind. My mind isn't totally set on it, or the preferences that I'm going to describe, because it may be you guys can tell me something better, or that I'm missing. I liked this one because it's billet, and it's supposed to be 7075-T6. I like the solid trigger guard also. It seems a little pricey, but if I'm going to go through the work to do it, I want it as right as I can. I'm asking for anyone else opinions or experiences with this before I buy. Anyone know of any other 7075 billet aluminum 80% brands? I intend on buying a jig, have seen them w/ so called hardened steel bushings, which seems like the way to go. Question lingering in my head about these, is if the outer surface of lower isn't totally flat, or once top plates of jigs are on, it may not sandwich the receiver right. Can anyone say a certain jig is better than others or more versatile for any reasons? Anyone ever had a problem w/ a certain brand of jig? I know you can say, well it should be milspec, well milspec has tolerances to, and I just have a hard time comprehending how any jig is going to hold it properly and secure?