If you still haven't decided... You can try reaching out to Centurion Arms, they might have some discount for M4C members and might be able to accommodate your request if you have a need for a particular muzzle device. Not guaranteed, but they are very responsive and accommodating.
I would personally avoid BCM comp on 14.5" upper - there are too many threads on here and other forums basically saying it's neither good at compensation (axial stabilization) nor muzzle flash reduction. Some reports have other concerns as well. It really sucks to have it pinned only to find out you don't like it. With A2 (or A2X) at least you're buying a known entity with a good flash reduction. At least you can live with it without being annoyed every time you shoot.
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