GC_UPC STERN DEFENSE MOD4 UPPER 9MM 16.1IN BBL MLOK RAIL MAP - show more like this Calculated in Cart DACK Outdoors GC_UPC STERN DEFENSE MOD4 UPPER 9MM 16.1IN BBL MLOK RAIL MAP - show more like this Calculated in cart GunZoneDeals GC_UPC STERN DEFENSE MOD4 UPPER 9MM 16.1IN BBL MLOK RAIL MAP - show more like this Huligan Arms GC_UPC STERN DEFENSE MOD4 UPPER 9MM 16.1IN BBL MLOK RAIL MAP SD15INMOD4MLOK16.1INBBL9MM show more like this 14.95 TheGunDock.com GC_UPC STERN DEFENSE MOD4 UPPER 9MM 16.1IN BBL MLOK RAIL MAP SD15INMOD4MLOK16.1INBBL9MM show more like this Free shipping over $400 (Excludes Ammo) Gman Sport GC_UPC STERN DEFENSE MOD4 UPPER 9MM 16.1IN BBL MLOK RAIL MAP - show more like this 9.99 SHTF Tactical GC_UPC Stern Defense AR-15 Upper Receiver, 9mm, 16.1in Barrel, 15in MLOK Rail, SD BU9 Bolt, SD CH1 Charging Handle, SCB 9 Comp Break, Black, 015-SD15INCHMOD4-KK $549.99 015SD15INCHMOD4MLOK161INCHBARREL9MM show more like this Dvor GC_UPC Stern Defense AR-15 Upper Receiver, 9mm, 16.1in Barrel, 15in MLOK Rail, SD BU9 Bolt, SD CH1 Charging Handle, SCB 9 Comp Break, Black, 015-SD15INCHMOD4-KK $549.99 015SD15INCHMOD4MLOK161INCHBARREL9MM show more like this Free Shipping on most orders over $49 Optics Planet GC_UPC STERN DEFENSE MOD4 UPPER 9MM 16.1IN BBL MLOK RAIL $561.44 SD15INMOD4MLOK16.1INBBL9MM show more like this Free on Firearms Acute Firearms GC_UPC STERN DEFENSE MOD4 UPPER 9MM 16.1IN BBL MLOK RAIL $595.40 - show more like this Free shipping on orders over $300 Skogen’s Gun Supply