I have that stock and can tell you it is very difficult to store a standard battery in it. Lipo yes but mini's are tough. the storage compartment is just that. storage for 2 x cr123 batteries.
I had a custom 9.6v mini battery made up and it fits but it's not easy to collapse or extend without some tinkering due to the placement of the wires. the stock had to be modified as well to have the wires routed to the right places. 2 batteries in the storage slot, and 2 rows of 3 in the buffer tube.
since then, I put that stock onto my m500 shotty and went back to a full stock on the AR.
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