This is ATFs response to Colts Mr. Chen,
It's a wishy-washy answer but basically says if the addition of a M16 carrrier doesn't cause the rifle to fire more than 1 round per trigger pull, then it's use in a semi auto AR15 would be legal. From this definition Colt now ships semi auto 6920s and others with M16 carriers.
By NFA law if any firearm fired more than 1 round with a single trigger pull it would be defined as a machinegun regardless of the type of carrier used.
Chief Armorer for Elite Shooting Sports in Manassas VA
Chief Armorer for Corp Arms (FFL 07-08/SOT 02)
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