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, Product Finishes, Shade Variations and Other Imperfections Are Normal Due to the Manufacturing Process ACC-SW-300-13IN-UPPER