Whatever your ideology it seems a little craven to not want guns that happen to be out in circulation to be as safe as possible from incidents like misfires from accidental dropping.
The market failed to innovate on safety for years. And the issue with a market based solution is it can be much cheaper to just not include any of those safety features.
Some things can be below your personal risk tolerance, but be well above the acceptable risk tolerance at a social level.
The market based approach states that if the demand is there, supply will come online if profitable. In this case it doesn't seem like the cost is more than $100-200 incremental, which isn't outlandish.
If enough people buy unsafe firearms and then are subsequently jailed for negligence, or the companies are sued out of existence, I would imagine the safe version would organically emerge.
I agree that drop tests and other ND tests are appropriate. Although I would prefer a market based solution here instead of regulation.