F OpticsPlanet Exclusive Moriarti AR-9 Upper Receiver Assembly, 9mm Luger, 4.5in, M-LOK, 1-10 Twist, Diamond Cut Free-Float Handguard, Multiport Muzzle Brake, Anodized Black, MAR-9MM-4-DMD-BCGCH-BLK $359.99 MAR9MM4DMDBCGCHBLK - Dvor