Nope! While places that supply tactical armor can refuse to sell to civilians if they choose:
Well that's fucking dumb.
For the record, IMO, that and firearms sales need to be regulated a lot heavier. I find it hard to fathom why people deserve the right to buy assault rifles, submachine guns and even heavy machine guns freely. Don't outright ban then, but for fucks sake, make the truly overpowered ones that much harder to obtain.
And regarding your second amendment rights, when that was added it was a product of it's time in 1791 to protect the states from oppressive federal government or invaders by allowing them to form militia's. While at the time most people had was rifles and muskets...a few rich people actually owned warships armed to the teeth so they could wage private wars. You can't really apply that setting to this day and age.