SPECIAL NOTE: I regret that I have lost the URL for the first section of the materials presented below.
What are some examples of where gun registration lead to gun confiscation?
Let's see...New Zealand, 1921 the ownership of revolvers were allowed in the name of personal defense, 1970s this list was used to confiscate all revolvers.
Canada...registration list 1990s, old guns grandfathered in, but this list is used for the state to confiscate the guns upon the death of the holder with no compensation to the estate
1996 Australia used its list of registered semiauto hunting rifles to confiscate all those weapons.
The UK government instituted handgun registration in 1921, and about every 10 years or so they further restrict what can be owned and use the registration rolls to collect what is illegal.
How about Chicago, put in registration of long guns, used that same registration to confiscate semiauto long guns in the early 1990s
What about California, couldn't make up it's mind if the SKS was covered or not (1989), decided AFTER the registration period was closed that they needed to be registered, declared a second 'grace period' for registration...then about 5 years ago they decided that those SKSs registered during the grace period were illegal because the grace period was illegal, and in certain cities and counties sent law enforcement to the listed addresses demanding surrender of the firearm. Because there is the legal option of removing the gun from the state of CA, and these officers had no warrants, smart gun owners turned them away with the claim 'I gave it to a relative in Oregon (or whatever)' but MANY were seized with no compensation. (Cities and counties later on offered compensation for anyone who had a receipt, but the police weren't giving out receipts, only a few people who demanded them had them and they were basically notes scribbled on whatever spare paper the officer had)
Side Note, the SKS was the MOST common weapon in the hands of Korean Shop Owners who used them to defend themselves and businesses when the LA riots happened.