Well, there is only 2 possible ways to do it. One, is to get a shortened EL-003 board and extend the control and motor leads and stuff it all the way to the rear, then insert your battery via the buffer cap. I don't like this approach, it takes too long and leaves lots of room for error, especially concerning the wiring.
The other approach is cut open the buffer tube to allow the battery to be inserted. But, the entire stock must be off, and the retaining bolt must be removed. I'm working on a solution to this that will allow for quick removal of the stock and still be strong enough to use a sling. It is a work in progress but is definately a viable option.
As well, you need to install a set screw into the takedown pin spring and guide hole to retain those if you install the UBR and plan to remove the stock for battery change. This is dead simple with a tap and a set screw,
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Age verifier Northern Alberta
Democracy is two wolves and a sheep discussing what's for dinner.
Freedom is the wolves limping away while the sheep reloads.
Never confuse freedom with democracy.
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