Got my new BCM 11.5" upper with Knight's Armament URX II Mid-Length Rail and Triple Tap Muzzle Brake. The lower is the one from my KAC SR-15 rifle. This gun is very controllable during rapid fire, much more than I thought it would be. I can shoot it almost as fast as my SR-15 (that also has the Triple Tap Brake installed on it) while keeping the T-1 RDS on the high-center chest with ease. Still getting used to the BAD lever. Grant from G&R installed the URX Rail and Triple Tap Brake for me. Thanks again, Grant!
Simply put: this new upper kicks some serious ass!