by jshuberg on Fri Oct 16, 2015 6:06 pm
There are replica and retro builds people do where they want it to look as close to the original full auto as possible. Some manufacturers have actually engraved a little circle where the sear pin would be so that it looks as close as possible to their full-auto brother. I don't know if anyone has drilled a sear pin hole and has been charged for it, but it could be an innocent reason for someone doing it. However, BATFE considers the presence of a sear pin hole to be constructive intent to build a machine gun. Even if there's no sear to be found.
Modifying a trigger group cannot make an AR15 fire full-auto without a sear of some kind. Period. It can however cause a hammer follow malfunction, which under almost every circumstance results in a light primer strike without detonation. Even in the case above, BATFE concluded after examining the gun it was not a machine gun. They had to look at it a second time, and find ammo sensitive enough that a light primer strike would get it to fire. BATFE does not consider the presence of a full auto selector by itself to make the gun into a machine gun. You can buy them without any paperwork, and install them in a semi-auto firearm if that's what you want to do. There may be more to the story, but it was not and could not have been a fully automatic weapon without a sear.
If the guy *intentionally* caused a hammer follow malfunction in order to get it fire fire an additional round or two per trigger press, he's a moron. However, the purpose of the law is to require registration of "real" full autos, the theory being full autos pose a greater danger to the public. Not to imprison a person for a malfunctioning weapon capable of occasionally firing an extra round or two. This guy and his gun posed a danger to himself, but does not in any way increase the risk to the public the way they theorize an actual machine gun does.
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