When I got into the sport last year in September, I read all the reviews and recommendations. Ultimately, I bought the King Arms M4 Full Metal. And I love it, it's a great AR. Lot's and lot's of compatability with the AR line of firearms. Since I do play rough, I've had only one problem with the gun over all. My fire selector frakked up. Instead of Semi-Auto, it now shoots full auto. Go figure. I hear it's an easy fix, which should be done this week. Hope this helps.
Les Baer 1911 Ultimate Recon 5" GBB
King Arms M4 Full Metal - CQB - modded