GC_UPC CMMG DISSENT Upper Receiver, Mk4, 5.56x45mm NATO, 6.5in, 1-7 Twist, 1/2x28 Thread, Zeroed Blast Compensator, Armor Black, 55B9331-AB $1,369.00 55B9331AB show more like this Free Shipping on most orders over $49 Optics Planet