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People in airsoft generally dont understand the "good enough" engineering method.
Tokayo marui mechbox shell for example; designed for 280fps. Will survive hundreds of thousands of rounds at 280fps no problem.
Upgrade it to 400fps, breaks in the first few shots.
Same goes for gears. You don't NEED 4140 hardened and tempered gears when sintered metal will do the same job at a third the price.
The shitty brittle potmetal that everyone thinks about is generally dirty zinc or magnesium alloy. Great for computer parts, bad for stuff thats actually under load. Magnesium alloys can be plenty strong, but not when you mix in an unhealthy amount of lead.
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