(1) a shotgun having a barrel or barrels of less than 18 inches in length;
(2) a weapon made from a shotgun if such weapon as modified has an overall length of less than 26 inches or a barrel or barrels of less than 18 inches in length;
(3) a rifle having a barrel or barrels of less than 16 inches in length;
(4) a weapon made from a rifle if such weapon as modified has an overall length of less than 26 inches or a barrel or barrels of less than 16 inches in length;
(5) any other weapon, as define in subsection (e);
(6) a machinegun;
(7) any silencer (as defined in section 921 of title 18, United States Code); and
(8) a destructive device.
[26 U.S.C. 5845; 27 CFR 479.11]
I know there are some people who are tying to get silencers off this list. Other than that, it's a pretty non-controversial list.
You'll notice that machineguns require a special permit. So do "destructive devices." This basically covers explosives. (That would include the ubiquitous bazooka or rocket propelled grenade [RPG] in the arms race question.)
So far as I know, the NRA or "Gun Nuts" aren't too concerned with this list. It's not a big issue. You want one of the items on this list -- you gotta jump through some serious government red-tape hoops to get them. Most people don't want anything on the list badly enough to get them.
By the way, if you do buy a Class III weapon, it does go on a national registry.
That's your arms race limit. You can go as high as you want until you hit Class III.
You can even buy your own tank! But the gun on the tank is a "destructive device" so you have to talk to the ATF about firing it. Most privately owned tanks have the gun permanently disabled.
I've met people who think an AR-15 is a machine gun. It's not. It's a big source of confusion because it looks like this:
(From wikipedia)
Those are M-16s of different models. These are machine guns and heavily regulated as a Class III weapon.
That's an AR-15. It's not a machinegun, and is not regulated as a Class III weapon.
Can you tell the difference by looking?
I can't.
It's what goes on inside the gun that makes a difference.
I'll try to take this slow, because it can get confusing.
You have basic designations for how a gun cycles -- that means how it loads the next round and prepares to fire.
Starting at the bottom:
- Muzzleloader -- old-school muskets -- you pour the powder and ram the bullet into place from the dangerous end of the the gun. (rifles, pistols, shotguns)
- Breach-loader -- old school rifles -- you load one round at a time through an opening (using a gate or lever).
- Single-action - two types
- Revolvers - you have to manually cock the trigger back to rotate the live round into place to be ready to fire. The old cowboy pistols. The Colt Peacemaker (Colt Single Action Army) is probably the most famous.
- Rifles and shotguns - either using a pump action, a lever action, or a bolt action, you manually remove the empty case and load a new round by working the action. This also cocks the hammer. Each time you fire a round you have to work the action once. Most hunting rifles and shotguns work this way. Examples include the Winchester94 (lever action rifle), Remington 870 (pump action shotgun), M1917 Enfield, (bolt action rifle).
- Double action
- Revolvers - one long pull on the trigger performs the "double" actions of pulling back the hammer and dropping it, rotating a new round into place for firing. End result - one trigger pull, one bullet comes out. Repeat as necessary. No safeties included. This type of pistol was popular with police for it's simplicity. The Colt Trooper and the Smith and Wesson .38 (Model 10) are icons of this type.
- Double-action only
- This one's confusing, but important. It's a mix of the double action and semi-automatic. It's automatic in the method used to eject the old case and load a new shell, but in order to fire it, you have the long trigger pull of the double-action that cocks and drops the hammer in one smooth motion. This removes the hair-trigger of the semi-automatic and makes the pistol safer. DOA is also known as a "safe-action" pistol. The most famous is the Glock style pistols used by many police departments in the US.
- Semi-automatic
- The "Automatic" refers the method of loading the new shell. You manually load the first one and cock the trigger, but the force from the pressure that pushes the bullet out also is used to remove the empty case and automatically load a new one.
- This gets confusing, because the "semi-automatic" pistol released in 1911, (called the 1911 because at lease something has to be simple) is known as a .45 Auto.
- Each time you pull the trigger, one bullet comes out. To fire again, you have to release the trigger completely and pull again. That's what defines the "semi" part of the semi-automatic.
- Famous examples include most guns used during WWII - the 1911 pistol, the Luger German pistol, the famous M1 Garand of WWII, and later the controversial AR-15.
- Fully Automatic
- This is a machinegun. Early full-autos kept loading and firing bullets until you released the trigger or ran out of ammo. Later models have an option to only fire 3 bullets, then stop until you release the trigger and pull it again. This is to increase accuracy and waste less ammo.
- As discussed above, this type is heavily regulated as a Class III weapon. This is what you'll see in most action movies and TV shows. The Tommy-gun, the AK-47, the Uzi, and the M-16 are famous fully automatic weapons.
So to answer the question - once you hit a certain type of weapon, whether it's a grenade launcher or a machine gun you have to get a special permit to obtain it, and pretty much everyone I know is okay with that.
Thanks for sticking around this long -- remember I promised I would talk about:
"Where to draw the line?"
Well here we go.
Most people have a pretty common set of beliefs as far as what's acceptable and what isn't. We're fighting over a pretty thin line. What do I mean?
Well, right now the line people are fighting over is somewhere in the middle of the semi-automatic rifle category.
Most people in the US are really pretty OK with Single action and double action guns. A large majority is OK with semi automatic handguns. And if fact, if you include a lot of older style semi-automatic rifles and shotguns, many people are fine with them too.
The fight right now is over such fine details as how many rounds can a magazine hold, and whether a pistol grip is more dangerous than an old fashioned rifle grip. We're arguing over whether the front stock can go all the way around the barrel (a barrel shroud), or if it can only cover the bottom portion.
Most people also agree that machineguns and explosives should be heavily regulated.
Most people also agree that machineguns and explosives should be heavily regulated.
At the end of the day, we're not that far apart on what we're willing to accept as a society. We're really pretty much in agreement. It's just the fine details we're fighting over.
I'd say we're actually doing pretty well.



