The financial meltdown of 2008 may have felt like the end of the world, but it didn't create a new long term trend, it was yet another brief buying opportunity.
Regardless, even at the peak of a recession, sear prices have remained remarkably resilient/immune to any notable price corrections. But we’ve had decades of relative political and economic stability with a heavy dose of long term low interest rates from most of the world’s central banks, which I must admit, has provided the ideal environment for bubble mania to flourish. We now have a bubble in the auto market, where anyone can get a loan, income has no bearing, and any credit score qualifies. Sound familiar? It happened with housing, now we have subprime auto sales in overdrive. Since we don't really make anything anymore, we have a debt based economy, and now that Americans are burdened with housing, auto, student loan, and credit card debit, it makes me wonder how much remaining credit we have to keep fueling this artificial economy.
With that said, we can agree that machine guns are a luxury asset, meaning that collectors will let these go if forced to choose between these prized heirlooms versus feeding their family and heating their home. Though it would likely require something along the lines of a fiat reserve currency crash of the USD or WWIII before we are presented with such a grand buying opportunity.