Let's say you had an extra $40k laying around and decided to get into the FA game. What gun would you buy and why? Bonus points if you have a good reason to buy a gun that doesn't use up the entire $40k budget.
M3a1 Grease Gun. Simple machine, open bolt, can mount suppressor, and used in multiple wars. It cost a whopping 15 dollars to make. I think the Thompson was 45, as comparison.
If I wanted something collectible, I'd go with a WWI vintage BAR. If I wanted something to shoot, I'd go with an M16 variant with a 5.56 upper, a 9mm upper, and a .22 upper.
I've got Macs which are great with Lage kits. 9mm and 5.56. M16 . Had mini Uzi . Full size Uzi is slow, almost boring fire rate. MP5s are damn expensive for what they are.
Fnc/ruger556 is damn near M16 money not worth it in my opinion.
If full auto was affordable because the right to keep and bear arms was no longer infringed upon, I would have a hard time debating between a true AK and an MP-5 even though H&K is far from my favorite company.