When you do, you have just registered your firearm for future confiscation.
Did you not realize that any time you purchase a firearm in Missouri, that "permit to purchase" is RETAINED by the sheriff?
We already have gun registration. Most folks just don't realize it.
As far as registration and seizure goes, wasn't it you who advised me to send letters to all the LEOs, advising them I intend to exercise my right to carry? If the day of gun seizures ever comes, you don't think that'll mark you out as the first gun nut to be visited by the SWAT team?
Handgun registration violates the Missouri constitution.