I am thinking about ordering a complete 10.5" upper to do an SBR build. What is the procedure for doing this? The complete uppers can be shipped straight to my home right? Do I need to send off paperwork before I order one? Does the lower have to be engraved before I order one? Can I own the upper before these things are done? I do have lowers in my possession that aren't engraved at this time.
Thanks
Thanks