So, I sold a couple of my pistols and I'm ready to buy my first AR-15. I'm looking for a fun rifle to shoot at the range that can double as a home defense/SHTF weapon. I have an .308 HK91 close, so I'm looking for just the opposite here, light and small. I'm pretty busy these days, so I'm not really looking for a project, just a fun rifle.
Here in communist MA my choices are pretty limited (we still have a AWB of sorts - but certain ARs are MA legal). Basically, I need to choose between the DPMS AP4 or the BM M4 - price is the same. From what I've read, they both seem like nice rifles, anyone have a strong preference of one of the other?