M16A4 in the Army

[jdun]

There is actually one case against one gun dealer in the USA that suppose to supplies to guns to the Mexican. That case has been drop because the Judge said the ATF faked the records.

You would expect more indictments on gun dealers across the USA because the serial numbers will lead them to the gun dealers. But again that isn't the case.

16" is standard AR for a lot of LEA. The US military used 16" in the past before Colt went with 14.5". 16" barrel is standard across the board so the point is moot.

The lowers is what the ATF considered a firearms on an AR. It is where the serial number is located. The upper are not considered a firearm. You can go to any internet gun shop and have it deliver to your home. You can get a 14.5" barrel or shorter deliver to your home. There is no law preventing you owning a 14.5 upper or less in the USA. However it is illegal to mate it with a lower that isn't NFA. Again the 14.5" vs 16" is a moot point.

Guns are exported to Mexico legally.

The guns that are used by Mexicans gangs are full auto. If they are able to convert to full auto they are capable of making it themselves.