At any rate if you want to talk about standard issue, what’s wrong with a modified M1a Springfield that runs an internal clip instead of a magazine? Given the choice I’d give militia men a bolt action over an M7 but there’s no reason we can’t go in the middle.
The major issue with mass casualty shootings is the ammunition availability. And that’s the problem everyone wants to solve. We could also go all in on red flag laws, fixing the NICS loopholes, and universal background checks. And if those work then we don’t need to do anything with magazines. There’s really a few paths available here, but if the NRA and friends keep putting a stop to any reform at all then they’re all going to happen at once.