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What mechanism type uses a motor-driven gearbox to compress and release a piston to fire BBs, commonly found in airsoft rifles?

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AEGs use a battery-powered motor to cycle a gearbox that compresses a spring and piston, propelling BBs at rates up to 20+ rounds per second. The Tokyo Marui company pioneered the AEG design in the early 1990s, revolutionizing airsoft (Deals) by offering reliable, affordable full-auto capability. AEGs remain the most popular platform in airsoft due to their consistency, upgradability, and ease of use in all weather conditions.