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 $454.29 015SD15INCHMOD4MLOK161INCHBARREL9MM show more like this Free Shipping on most orders over $49 Optics Planet GC_UPC Stern Def. Upper 9Mm 16.1 in 15 in M-Lok Handguard Black 015-SD15MOD4MLOK1619MMKK MAP 015-SD15MOD4MLOK1619MMKK show more like this Flat Rate Starting at $11.99 Hinterland Outfitters 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 Def. Upper 9mm 16.1" - 15" M-lok Handguard Black $494.08 - show more like this Tactical Surplus USA 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 Def. Upper 9Mm 16.1" 15" M-Lok Handguard Black 015-SD15MOD4MLOK1619MMKK $525.22 015-SD15MOD4MLOK1619MMKK show more like this Firearms $18.45, Free over $500 Shooting Surplus GC_UPC Stern Defense 9mm Complete AR-15 Upper for Glock-Style - M-LOK - 16" $534.45 015-SD15INCHMOD4MLOK16.1INCHBARREL9 show more like this Calculated in Cart Primary Arms GC_UPC STERN DEF. UPPER 9MM 16.1 15 M-LOK HANDGUARD BLACK $534.45 015-SD15MOD4MLOK1619MMKK show more like this $10.95 flat rate GunStuff TV GC_UPC Stern Defense Ar-15 Sd Mod 4 9mm Upper Receiver M-Lok Complete - Sd Mod 4 9mm Upper Receiver 16.1in M-Lok Complete Black $544.99 015SD15INCHMOD4 show more like this additional Brownells 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 AR-15 9mm Luger Complete Upper Receiver Assembly 16.1" Barrel Free Float M-LOK Hand Guard Matte Black $595.01 015-SD15MOD4MLOK1619MMKK show more like this $10 Flat for Firearms Cheaper Than Dirt