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the only battery that i know of that will fit "inside" the xcr in the little chamber is the socom gear one specially made for it. However they are a rediculous price of like 69$ a battery or some shit and they are only 1000mah.
Your best bet if to get the buffer tube mod and go with a buffer tube style battery. it takes away from the collapsable stock etc but really who uses it anyway?
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