Quoted:
Should I go with the FN which I can find pretty easily right now or try to find the Colt which is a little harder to find? Or just go all out and buy the BCM? Also is there upside to the Colt over the FN or are they pretty much equal rifles?
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Go with which ever one you like. Some guys are stuck on Colt rollmarks, but remember that you are only building a clone. Not everyone gives a rat's behind about rollmarks. I built mine with a CMMG model. I added the KAC M5 RAS, MaTech BUIS, Trijicon TA31RCOA4 ACOG, sling, and mag pouch.
There a few variations when it comes to building an A4 clone and you have to determine which route you are wanting to take. You can do a search and look at the various configurations of the M16A4s being used. Mine is patterened after a USMC variation.