It really all depends on the actual guns in questions, but its easy to do. Put what the gun cost way back when into one of the on-line inflation calculators and then compare this to what the selling prices are now. Then you can figure the rate of return over the years (positive or negative). The $80 SKSes have done better than inflation by a couple of percent which is better than most savings accounts have done. But the situation is so messed up now, that we get way more in "cash back" rewards from putting everything we buy on the credit card than we do in interest on the cash that backs the card to get the "bonus rewards" tier.