Disclaimer: This thread is neither for, nor against gun control. It is about a facet of gun control that triggered my curiosity. Also, in this thread, I am discussing only legally owned NFA weapons.

Flipboard flipped me a new article about the numbers of NFA weapons registered in each state. For those that don't know what a NFA weapon is, read the following quote:

In 1934, the National Firearms Act was signed into law by President Franklin Roosevelt. Among its provisions, the law stipulated that certain types of firearms need to be registered with the Secretary of the Treasury, and that owners of those firearms were subject to a $200 tax – equal to nearly $4,500 today. The types of weapons covered by the law, such as machine guns and short-barreled shotguns, were largely associated with organized crime during the Prohibition Era, and the NFA was designed to curtail their use.

Over the nearly 90 years since the law’s passage, some significant changes have been made – including a 1986 provision banning the transfer of possession of machine guns not grandfathered in. Otherwise, Americans seeking to own NFA weapons must first receive official approval after completing a registration application and submitting a fingerprint card and the $200 tax payment – which has never been updated to adjust for inflation.

Weapons registered under the NFA fall into one of six categories: machine guns, silencers or suppressors, short-barreled rifles, short-barreled shotguns, destructive devices such as bombs or grenades, and “any other weapon,” which is a catch-all classification that includes certain firearms that can be concealed in items such as pens or walking canes.
[snip]
Nationwide, there are over 7.5 million registered NFA weapons, or 2,300 for every 100,000 Americans. Depending on the state, the number of federally-registered weapons ranges from 462 to over 24,000 for every 100,000 people. (highlighted by Mike)
Now, that's a hell of a lot of weapons that are judged by the government to be too dangerous for routine ownership, yet are legally in the hands of the public!

The article got me to thinking about the last time I can remember a legal NFA weapon being used in a crime. I can't remember a single one. 20 minutes of searching the 'net didn't find one, either. I did come across a few anecdotal message board posts suggesting that there may have been a couple of murders, but nothing to support that. Perhaps I'm not using the correct search parameters. I don't know.

That got me to wondering how that can be. With enough legal NFA weapons in private hands that ~2.3% of the population could own one, why are they not used in crimes?

A look at the differences in obtaining a NFA weapon as opposed to buying any other firearm at your local gun store shows that it is slightly more difficult to purchase due to requirements to file additional paperwork, including your photograph and fingerprints to the ATF for approval. It also costs an extra $200 for a tax stamp, and a long wait while the ATF determines if you will be approved to own the weapon. If approved, your weapon will be registered with the ATF, while a regular gun purchase goes without registration. I know how all that works from personal experience, and believe me, the anticipation of being approved is worse than a five year old waiting for Christmas!

Is that enough to prevent NFA weapons from being used in crimes? I can't see why unless time is of the essence, or if the extra $200 tax would cause criminals, and soon to be criminals, to buy a less expensive weapon.

Perhaps it is because known criminals are denied the purchase, but that doesn't account for owners who commit a crime sometime down the road.

Maybe it is because the kind of person who submits to the minimal scrutiny of an NFA background check and pays the extra tax is a type of individual who can be trusted with these weapons.

Maybe it is none of the above and just the chance of the draw that legal NFA weapons are not used in crimes.

I don't have the answers, but understanding why legal NFA weapons may be crime free could possibly be applied in a manner to help prevent our spate of mass shootings. Or, not.

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One thing I can draw from this study is that it is not the gun that is killing people, because the most deadly firearms, legal NFA firearms, are not doing the killing. It is evil humans doing the killing. Now if we can just figure out the difference in ownership, maybe we work on solving the problem.