Buyers should prioritize material durability, typically opting for high-impact ABS plastic or nylon fiber to ensure the product withstands rough play. The firing mechanism (manual bolt-action, electric, or gas-powered) must be selected based on the target age group. For safety and performance, verify the muzzle energy (measured in Joules) and velocity (FPS) to ensure they fall within legal limits for toys. Additionally, look for modular rails (Picatinny) that allow for the attachment of scopes, bipods, and silencers, as these features significantly increase marketability.