Open it up carefully. Put it in a bag or a box to avoid parts from flying everywhere. This is one instance where I love not having an AR latch (ASCU upgrade - pull motor = spring release) or have the modify AR latch installed to release the spring.
You can also try to release the AR latch manually through the gearbox openings.
Fully charge your battery next time and don't use them after you notice signs of a depleted battery. A higher voltage battery won't release the piston unless your motor can turn with that much resistance which only few of can.
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