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Q Sugar Weasel Complete Upper Receiver 300BLK 13 Threaded Barrel 1 2X28 Carbine Length Gas System Matte Finish Black and Tan Free Float M-LOK Rail Adjustable Gas Block Does Not Include Bolt Carrier Group ACC-SW-300-13IN-UPPERYou've asked for it and we've made you wait long enough. Q finally offering individual upper receiver assemblies. Designed as a replacement upper for your standard Sugar Weasel or for whatever Frankenstein build you can think of. This upper receiver is paired with a 13 1/2-28 threaded tapered barrel and their adjustable gas block with carbine length gas system.