Originally Posted by
3ACR_Scout
I'm surprised no one has mentioned it, but I'd recommend BCM for the simple fact that they offer mid-length gas systems and Colt doesn't, which if you've done some reading here, makes the recoil a little softer and extends the life of the rifle and its components compared to a carbine-length gas system. I'd recommend choosing a complete, 16" mid-length gas system BCM rifle for him. Colt is an excellent and proven brand, and I just got a Colt lower myself to build an M4-style rifle (do people still say "M4gery?"), but I'd recommend a BCM in this case.
Dave