Grid Defense 16" 5.56 Quad Rail Upper Receiver - FDE

• FDE Cerakote Finish
• Chambered in 5.56 NATO
• A2 Flash Hider
• 16" 1:7 Twist 4150 M4 Barrel - Black Nitride
• Carbine Length Gas System
• Grid Defense 14" M-Lok Free Float Quad Rail
• Grid Defense Mil-Spec 7075 T6 Upper Receiver

*****Ammunition Notification***** Grid Defense test fires every custom upper to verify cycling. We do not guarantee cycling with all ammunition due to vast differences in the quality of ammunition. We will only warranty cycling with US made ammunition. We will not warranty cycling with imported, steel cased or reloaded rounds.