In the eyes of experts, weapons can reveal many things, including combat effectiveness. The same applies to handguns—different types, styles, and models of handguns have various performances targeting different users. Different users reflect a certain level of combat effectiveness. For instance, anyone wielding a Desert Eagle is definitely not an ordinary police officer; apart from regulations prohibiting its use, ordinary officers would struggle to handle the heavy, high-recoil, large-caliber Desert Eagle efficiently.
Assassins' guns are often modified by specialists tailored to individual styles. Hence, even if one has extensive knowledge, it might be hard to deduce the owner from a modified gun. But with familiarity with guns and sharp professional instincts, one can still gauge the opponent's level of proficiency.
