wingnut308 said:
Most builders have some pretty long wait times. I sent my kit/receiver to my builder to get in line, and my Form 1 to the BATFE. Your builder can build it and sit on it until you get your form back.
That is very, very risky business because you did not have the gun in your possession- basically, you sent a Title I receiver to a guy, it became a Title II weapon (different), and it went back to you without going through the proper channels- which is illegal. You didn't make it a Title II weapon, it was at some random manufacturer when it became a Title II weapon- but on a Form 1, you put yourself as the manufacturer of the weapon.
If you own a Title II gun, or a Title II receiver, you can send it to whoever to have it built. There are still people sitting on legal Stemple machine gun receivers (AKA a piece of muffler pipe with a serial number) that haven't been built yet. There is no time limit to this, you just have it built when you do.
pawnman, when it comes to the barrel- unless you own an AR15 pistol, I would not buy the barrel. It can be considered "constructive intent" to make an illegal NFA weapon if you own the short barrel but no SBR or pistol that it can legally go on. For instance, I have an Uzi, before the SBR was approved I refused to get the short barrel for it to be on the safe side.
Of course, you are in unique shoes being a firearms dealer. As such, your gun shop can own 11" barrels for sale to someone who owns a SBR or an AR-15 pistol. You, necessarily, don't have them, your business does.