Is this video accurate? Do fingerprint cards and photo have to be within a given timeframe? As in, could a person get that squared away a day or two in advance of submitting the eform1 and have it ready to put in the mail as soon as the cover letter gets emailed back after submitting the application? Would it be more sensible to use a common chambering for an SBR than an obscure cartridge? I would be SBRing a TC contender and I have a total of 4 barrels, 2 common calibers and 2 somewhat obscure. My plan would be to use the barrels interchangeably on the SBR reciever. Example being 30-30 Winchester as opposed to 7-30 Waters.