Patriot73
I have never used Enterprise but I have heard a lot of things about them. Most bad. They are not a quality receiver as far as I am concerned. If you are building on DSA receivers then I would stay with them. All other recievers are not as good as DSA. DSA is the best. The only reason to build on an Enterprise is that they are the only company that makes an inch reciever.
Imbel uppers are not banned. They are still being imported by a number of companies. I just built an Imbel out of a Dan's grade III kit on a 2003 Imbel gear logo receiver from FAC. It is a sweet shooting rifle.
The key factor in using an Imbel reciever is 922r. This is the law that determines the part count. In the case of an FAL there must be 7 US made parts if you have a muzzle attachment (brake or fake FH) or 6 US made parts if there is not muzzle attachment. If you build on an Imbel receiver then you must replace 7 other parts. If you build on a US receiver then you only have to replace 6 parts.
Hanko
You are correct. It was Interordinance. IIRC the problem was that when the receivers were demilled they were not cut properly. They left to much metal in the mag well area so that the receiver could be rewelded.
BigDozer66
Century, Imbel and DSA all make type III Recievers. I would use either Imbel or DSA.
FAC (Dan Coonan)only makes a type 1 reciever at this time. The FAFAL1 is with carry handle cut. The FAFAL2 is without carry handle cut.
DSA is the only company that I know of that is making a type II metric reciever.
I think that is all I have right now.
Rusty