I think I'm overthinking this problem, but it doesn't seem intuitive: if 184 million people drive daily resulting in 33,000 fatalities yearly, and there are 1.5 million gun owners who use their guns yearly, resulting in 776 unintentional fatalities yearly, what would be the equivalent fatality rate if adjusted for daily gun use?
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It's impossible to answer this question sensibly without knowing more details about what "yearly gun use" means. At one extreme, all gun owners use their guns every day, so "yearly gun use"="daily gun use". At the other extreme, all gun owners use their guns one day per year, so if instead they used their guns every day, there would be 365 times as many unintentional fatalities each year, or 283,240.
The naive way: $184$ million, $33000$ fatalities = $179$ fatalities per year per million people. $776$ fatalities yearly naively becomes $776\times 365=283240$ fatalities per year = $188826$ deaths per year for daily usage per million people. Voilà! Guns are $1054$ times more deadly than cars.
Note that this is extremely naive. First of all, yearly gun users may not use their gun only once per year - that is quite unlikely (given most of them hunt a lot or practice at ranges a lot). Secondly, deaths with guns are usually 1. accidents 2. attacks. In the first case, using guns daily will improve skill a LOT (try finding a soldier who accidentally shot himself in the foot so hard he died). In the second case, murderers don't murder people as a linear function of gun uses (I WILL MURDER A PERSON EVERY 100TH TIME I USE A GUN MWAHAHA), but as a (roughly) linear function of people they unfortunately want to kill.