When was the last mass shooing a machine gun was used? I'm thinking maybe 1930s?
And how long has it been that machine guns were readily obtainable, simply by a purchase at a gun shop, or from the guy down the street - LEGALLY?
I think 1934..there are still roughly 500K legally owned in the US...any of them been used in a mass shooting recently?
Can I buy one today down at, say, Dick's Sporting Goods?
If they have one for sale and you have the right tax certificate, yes. Lacking either of those things, no.
IOW they are not readily available,
and they are rarely if ever used in mass shootings nowadays.
IOW, you have no idea what you're talking about. Machineguns for sale - machineguncentral.com full auto NFA firearms And, I'm not sure why you said "nowadays". Has their EVER been a mass shooting with an automatic weapon?