Someone posted an excerpt from a legal source with some bold text at the end and then pointed to it as being a rule to abide by in reference to having the parts to make a pistol or SBR. In general "if" you have "ALL" the parts to make a SBR in your possession you "could" be charged with the crime of maintaining an unregistered SBR; this is true generally. However, there is a huge amount of gray area here and merely having a barrel in and of itself is not illegal (you can go online and order them all day). What the ATF is interested in is if you are actively trying to build an SBR (or NFA) weapon illegally. It is true that "technically" you could be charged if you had a rifle and then a SBR upper with no other parts as it would indicate that you intended to develop a SBR illegally.
