Sure, that's legal
If it was manufactured (and registered for private sale) before 1986, you complete BATFE Form 4, and pay a $200 tax (in addition to the several $K for the gun, plus sales tax and transfer fees)...
If it was manufactured (and registered for private sale) before 1986, you complete BATFE Form 4, and pay a $200 tax (in addition to the several $K for the gun, plus sales tax and transfer fees)...