I bought one when they first hit the market, installed it, ran a full mag through it (NY is limited to ten rounds) in the dead of Winter and had no issues, and off-hand the accuracy was good. I didn't bench it or shoot for groups, and the ammo was a mixture of loose remnants. IF a rifle is going to give you issues, you can damn well bet they will when it's below freezing with three feet of snow on the ground.
I've had issues with BCA before, and others that were just fine, in fact I have bought their uppers just to use the side charging upper and Bolt. (built a .358 Winchester using a KAK Barrel, Gorilla adjustable gas block, and custom free-floating handguard) that shoots like a champ!
When you mass produce at an economy level you're bound to get a few lemons, but that doesn't mean they're all sour.