Wanting to make an SBR. AR15 7.62x39 with a 10.5" barrel. Ive read through the form1 sticky and some others. Im not good with legalese... Can I register my current DPMS lower as the SBR? Then can i continue to use rifle length uppers as well as the SBR upper? I think ive read that you can. I am familiar with the TC contender pistol/rifle/ and switching back laws. Seems similar. I downloaded the form from the ATF website and skimmed over it. If i were to build this off of a new lower, and cant build until the stamp arrives, how am i supposed to know the serial number? Or am i supposed to have the receiver in hand first? Seems like a sort of gray area to me. Ive seen that CLEO doesnt need to sign or even look at it, other than receiving a copy of Form1. Is this correct? And finger prints, where do i get that done at, the police station? And does it have to be in your home town, county, or state capital? I work in the state capital city, but live a county north in a tiny town without a police force. Do i just go to the sheriffs office in the county seat? Im totally new at this and need all the help i can get!