I'm contemplating my first 308 AR build, and I've narrowed it down to starting with matched receivers from either SI Defense or Mega. I like the DPMS pattern choices for these platforms, especially due to the parts available in terms of BCG's (like JP QPQ'd low-mass and SI FailZero BCG), and barrels. I was sold on Mega for the longest time--they look great and get very positive reviews and press. However, I've now come across the SI Defense matched upper/lower and really like the fact that they are a vet owned company AND will treat the upper/lower in FailZero. Help me decide...I've seen lots of positive comments on both platforms from members here. What do you all see as the pros/cons to both platforms? What build components have you found are particularly well suited to either/or both? Should I be so smitten with the choice of FailZero on upper/lower, BCG, and charging handle? Thanks in advance for any thoughts or suggestions...