When sourcing from a factory, prioritize all-metal construction (such as zinc alloy or stainless steel) to ensure durability and a premium tactile feel. Key features should include a functional shell ejection mechanism, a movable slide with blowback simulation, and a detachable magazine. Ensure the scale is typically 1:3 or 1:4 to balance portability with intricate detail. For safety and compliance, the barrel must be permanently blocked and non-functional to prevent any modification into a real firearm.