Right now the biggest obstacle to moving forward is the ammo shortage which prevents any extensive testing. None of the other parts are regulated and are generally available, or will be when the component shortage clears up.
Again at Insty, this candidate for QOTD:
DEHUMANIZING ELIMINATIONIST RHETORIC: “[Anyone] who would run out to buy an assault rifle after the Newtown massacre has very little left in their body or soul worth protecting,” tweets Jim Carrey, in-between sparring with moviegoers on Twitter who disagree with his anti-Second Amendment viewpoint.Actually, Jimmy-me-boy, anyone who ran right out and bought a Personal Defense Weapon(R) immediately following Newtown is today being described as "prescient". Doubly so if they bought 1000 rounds of ammo and 2 more standard capacity mags to go with it.
Anyone going out today and doing the same thing will have very little left in their bank account worth protecting.