someone brought up the point that voting is a right, yet 48 states require you to register to vote.
The right to keep and bear arms is in the Bill of Rights.
The right to vote is not.
Actually, subsequent legislation written by the Founding Fathers aludes to their acceptance of registration - but not as a requirement for possession. The Militia Act Of 1792 states "each and every free able-bodied white male citizen of the respective States, resident therein, who is or shall be of age of eighteen years, and under the age of forty-five years (except as is herein after excepted) shall severally and respectively be enrolled in the militia" and "every citizen, so enrolled and notified, shall, within six months thereafter, provide himself with a good musket or firelock ...". Note, however, that such registration of gun owners is not designed to prevent anyone from owning guns, but instead practically compels them (18-45 year old males at minimum) to be armed, so they may be "called up" as the Constitution permits and the 2nd Amendment alludes to.
Of course, the underlying premise is that all those people are armed, and capable of revolting.