I've heard both good and bad about BCA products. Some say they are an excellent deal while others complain of various issues.
As a cheap way to try out .300AAC, I bought a BCA 8.5" upper complete with BCG for $184 shipped.
I've only had it out once with ~100 rounds through it, but so far I am happy with it.
Fit and finish is decent and it had no issues but it doesn't seem to be exceptionally accurate.
For under $200, it is acceptable (3-4 moa) considering it's only 8.5" long.
I also have two of their stripped side charging uppers with BCGs but haven't had a chance to build them yet.
The fit and finish look good but I have heard of issues with the charging handle coming loose if it isn't Loctited on.