I've been getting a lot of people asking why I don't sell complete AR uppers. I have a Class 01 FFL and I've been scared about anything that could be construed as "manufacturing", so I've been selling individual parts, unassembled. But I have a lot of customers interested in buying complete uppers mostly. So my question is, as a Class 01, is there anything with an AR that I can assemble and sell and not be in violation of manufacturing? Such as, can I assemble a complete upper (upper receiver, BCG, charing handle, barrel, handguard, etc)? Can I assemble a complete lower by itself (lower, LPK, buffer, and stock)? Can I do one but the other?