If I was buying my first AR15 now, I would consider buying a AR15 pistol. Especially useful if you have a Georgia Weapons Carry License. The AR15 pistol can be turned into a rifle later if that is what you want to do, but you can not turn a AR15 rifle into a AR15 pistol.
Interesting...would anyone know? My dad has TC contenders that he swaps back and forth between rifle and pistol. Is that breaking the law? If you can legally own a pistol does it matter?