You can buy it from anyone who can sell it to you, a dealer or an in-state resident FTF between two licensed persons. If a dealer sells you one, it's their problem. (unlikely to find one that would, but some dealers have "creative" interpretations of the regs. )
There is no barrier to "possession" via handgun compliance. The act of the dealer transfer is the "regulated" component here, not the firearm itself, or ownership of said firearm.