first remove everthing that is holding the mechbox in the reciver out (rear pin, center pin, pistolgrip/motor), then you should be able to press the arm of the mag catch in a bit and just twist off the pushbutten on the other side.
carefull not to brake off the thin metal that stops the magcatch from falling into the magwell.
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Weapons Technician / Gunsmith
Don't look at me, I don't know, lol ¯\(°_o)/¯.
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