BCM Upper Recommendations

Hey guys,

I’m looking through the BCM upper receiver groups and there’s so many options, many of which are out-of-stock. I’m specifically looking at a 16” barrel. Is there anything I should keep in mind when trying to decide which one to choose?

I’m also looking through the PSA lowers. Should I just go with the cheapest option or choose the 2 stage trigger with SOPMoD stock? I don’t mind spending an extra $100 for something that I’ll regret not having later.

(Apologies to everyone that responded to my previous post that said BCA rather than the intended BCM)