Which of the following qualifies as a short barrel firearm?

A short barrel firearm is classified based on the length of its barrel and overall length. In this context, shotguns, rifles, and handguns have specific criteria for what constitutes a short barrel firearm under federal law.

For shotguns, the overall length must be 26 inches or more, but if the barrel is shorter than 18 inches, it qualifies as a short barrel shotgun. The stated option about the shotgun with an overall length of 25 inches indicates that it does indeed have a barrel that is likely shorter than the legal limit, thereby qualifying it as a short barrel firearm.

Other options discussed do not meet the specific criteria for classification as short barrel firearms. For example, a rifle of 30 inches overall is compliant with standard regulations, while a handgun with a barrel shorter than 5 inches doesn't fit the general classification of short barrel firearms, as handguns aren't categorized in the same manner. The pistol with an overall length of 10 inches also does not meet the established short barrel firearm criteria.