I dunno if anyone has said it yet or not(Probably have, I just haven't skimmed through the comments) but BCM is a great manufacturer. I have an Aero precision lower on my AR with a BCM bolt carrier group and upper receiver. To be honest, lower receivers arent that important in an AR. So you can by just about any lower you want and just smack a good quality upper receiver on it. Overall I think mine was about 1100 or so before my optic. I went with a holographic and a 3x magnifier because I like the adjustability. Mine is also an SBR, but its about the same price for a full 16" length also. Maybe even a little cheaper.