Yes, it's an SBR, but I'm not sure why it has to be locked up.
This ^^^^ among other things.I am going to disagree with the guys above.
It is not an SBR until there is a short barrel upper on it. Right now it is still just a receiver. You could sell it as a normal receiver. I believe you have not manufactured an SBR, yet.
There is a letter from the ATF (take it with a grain of salt) but you can transport and move an SBR lower with a 16" upper on it and it is considered a regular rifle in a Title 1 state of existence.
Then for the guys who say that you are supposed to have it engraved...That is a whole new set of arguments
But, I would say keep it in the safe, cause firearms are safer in a safe
Quick question along similar lines...
If I were SBR my MPX pistol, but remove the stock and replace it with a brace when I travel across state lines, what would it be considered? A registered SBR or a pistol???? I've been told once it is registered as an SBR, it will always be considered an SBR.
This ^^^The difference is yours is a pistol, you can change it back to pistol configuration, with no problem. The same if you add a 16 inch barrel- then it is a rifle. Or remove the stock, and add any length barrel- then it is a pistol.
My understanding is once an SBR always an SBR applies to converted rifles. They cannot be converted to a pistol, unless you remove it from the records.
Quick question along similar lines...
If I were SBR my MPX pistol, but remove the stock and replace it with a brace when I travel across state lines, what would it be considered? A registered SBR or a pistol???? I've been told once it is registered as an SBR, it will always be considered an SBR.
The difference is yours is a pistol, you can change it back to pistol configuration, with no problem. The same if you add a 16 inch barrel- then it is a rifle. Or remove the stock, and add any length barrel- then it is a pistol.
My understanding is once an SBR always an SBR applies to converted rifles. They cannot be converted to a pistol, unless you remove it from the records.