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@ Wilsonred5
I have the same problem your having with my friends ECHO1 M4. We swapped out spring for factory M100 ish spring before our first fire. Hooked up a 9.6v battery (not the included one) and same thing as you it fires once or twice then the gearbox seizes.
I've taken this thing about like 20 times and reassembled and regreased too. I don't know if Echo1 had a short bad line of gearboxs.
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