I got two Danish CMP garands for $350 and $400 at a gunshow in 1997.
If they are worth $3k today, that would be 9% and 8.4% compounded annually.

Usually guns make an average of 3%, while outliers Colt revolvers can make 9% and Mossberg bolt 16 gauge shotguns can make less than 1%.

3% would make my garands worth $735 and $838.

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. -Ernest Hemingway
The man who makes no mistakes does not usually make anything.-- Edward John Phelps