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Yes, you need to cute down the tube in addition be able to reroute the wire coming through otherwise you can use crane stock for storage the battery. Hope it hlep.
It's nothing shorter in there, it would have the same length as regular M4 that has the tube before modify to fit crane stock. It's just give place to put the lipo battery an can be able to reroute the battery. Go to G&P website, they have a manual how to do it.
KND
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