Now that my first project is pretty much done, I decided it was time to bring my second project closer to completion. With that said, I ordered a Spikes lower assembly from Brownells today to match up to the YHM BDS. I'm assuming that since both names are fairly well known for broad compatibility that they should mesh well together, I believe. However, after making assumptions on my last project cost me time, money and hair pulling that I would rather avoid this time around. Since both are complete assemblies, all the rifle should need is an Eotech w/magnifier and AFG thrown on and it's done. Anybody using a Spikes lower + YHM upper want to chime in? This will be my wife's rifle. I'm quite excitedly awaiting the lower so we'll have 2 functional and fairly nice AR's up and running.