Depends. If it isn't a build from a stripped receiver, then the serial number dictates what it is.
What gun are you talking about, and is it being built, or a factory gun? A little more info would be welcome.
For example, if you build a stripped AR15 with a 20" barrel, unless you physically put a rifle stock on it, it can be whatever you want, rifle, "firearm", or pistol. There's nothing against a pistol with a VERY long barrel.
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