Register/de-register: SBR, SBS, and AOW can all be de-registered so long as they are returned to non-NFA configuration prior to request submission. As was said above, "de-registration" won't actually remove any records from the NFA registry, it will simply add/annotate that the weapon was returned/placed into a permanent non-NFA status. That allows the weapon to be relegated to Title 1 "normal" status with regards to the law. A machine gun cannot be de-registered. "Once a machine gun, always a machine gun" rule. To remove them from the NFA requires destroying them and you need to maintain proof of said destruction (think torch cut serialed receiver section, etc.).
In my experience about the only premium for registered short barrel weapons is for those that are factory registered. If you form 1 it and have "Joe-Bob's P&G" etch a sketched on the lower it is typically worth less, and often difficult to dump for that matter. Compounded stamps from moving them around also makes them less attractive. The same goes for cans. Pays your money and get darn good ones, because the re-sell market for cans is pretty low.
You can buy the best or worse can on earth, but it'll cost you $200 bucks either way. You'll never get that $200 back, so make it worth your while!
In my experience about the only premium for registered short barrel weapons is for those that are factory registered. If you form 1 it and have "Joe-Bob's P&G" etch a sketched on the lower it is typically worth less, and often difficult to dump for that matter. Compounded stamps from moving them around also makes them less attractive. The same goes for cans. Pays your money and get darn good ones, because the re-sell market for cans is pretty low.
You can buy the best or worse can on earth, but it'll cost you $200 bucks either way. You'll never get that $200 back, so make it worth your while!