I thought the LMT EBCG was designed specifically for the 14.5" M4? Not that the Colt BCG comes up short or anything, just that the OP's barrel length is what LMT designed it for.
To wit:
http://www.sadefensejournal.com/wp/?p=3188
Is it overkill? Perhaps, and certainly pricey. I have two in carbines and two more in storage. I like them, and if you have the $$$ go for it. That said, if your budget is tight the Colt BCG should do just fine.
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