Even in the Colonial Period, felons could be disarmed.
The trouble is that the definition of "felon" has changed. In the past, it was things like burglars, arsonists, murderers, rapists, those who commit mayhem, and armed robbers. The definition has been expanded by statute and while some are good, not all restrictions would have been recognized by our founding fathers.
Vigilantibus et non dormientibus jura subveniunt. Molon Labe!