I don't think we need SBR/SBS/suppressors (and probably AOWs and most DDs) under NFA at all, but I'm kind of ok with at least making the requirements for select-fire consistent for individual vs. organization, especially after that LAPD Dorner guy.
His is the only second case I'm aware of since 1934 of a legally owned NFA weapon being used in the commission of a crime. I'd strongly disagree with the claim that two criminal incidents in 79 years is sufficient reason to put additional roadblocks in front of the 2nd amendment.
Honestly, it doesn't make sense to put anything under NFA. Silencers are harmless, SBR's are bigger than handguns, and full auto is going to be less effective in the hands of a nutcase than semi auto. There is really no sane justification for it at all.
I'm fairly pro gun but I feel slightly uncomfortable with random people with crew served weapons, mortars, GMGs, etc. Although I trust most random people with $50k to spend more than I trust police departments with weapons like that.
There's an upper limit, I'd say. For me, it's a .50 cal M2 or similar machine gun. I don't think those should require extra paperwork. If you want a 20mm or a destructive device, I can understand regulating that. The 2nd Amendment's intent is served well by free access to small arms, I would say. That is enough.
Pat Buchanan came up with a more permissive metric, "anything that doesn't require a trailer hitch", although I can't see there ever being support for indirect fire weapons like mortars.
However, if an armed citizenry is supposed to keep the government in check, why not HEAT warhead anti-armor weapons? E.g. in the context of this discussion: https://news.ycombinator.com/item?id=6186569 which touches on the widespread police procurement of light armor.
