What size of LiPo can you fit in there?
I'm going to be looking into this as well (yeah yeah, buying a PTW), but your method is pretty well perfect.
If your going to leave the compartment doors on the UBR, do you think it's possible to hollow it out and just have your battery in the sliding section of the stock, with access through the buttplate?
I'm not at home to look at mine right now, but at first glance it seems like there's enough room to slap a small square LiPo in there....
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