Armstech AR-15 upper 10.5" stainless bull barrel progressive twist 11 to 7 with gas trap system with LaRue quad rail surefire m900 grip and Yankee Hill BIS. Surefire or YH QD suppressor flash suppressor. This is a very unique item and hard to find. See this link Arms Tech Limited $1100 without grip, $1350 with grip Reasonable offers considered. Rodney, text me at 512-496-4301 or rhwarner@me.com