AR-15 | AR-10
Grid Defense is the first stop for your next AR15 build with our wide variety of barreled upper receivers to choose from. We offer a multitude of options from barrel length, color, handguard designs, and caliber. Whether you are a beginner or experienced gunsmith our uppers are designed to be easy to expand while staying cost friendly. Check out our Upper and Lower parts for everything else you need to complete your build.
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Grid Defense 16" 9mm Stainless Steel Upper Receiver - Black
Sale: $329.00MSRP: $399.00Grid Defense 16" 9mm Stainless Steel Upper Receiver - Black Milspec 7075-T6 Upper Receiver 16" 416R Stainless Steel Barrel with 1:10 Twist Rate 1/2x36 Thread Pattern 14" Grid Defense Octagon M-Lok Rail Hard Coat Black Anodize A2 Muzzle Device Chambered...Sale: $329.00MSRP: $399.00 -
Grid Defense 16" 9mm Stainless Steel Upper Receiver - Tungsten Gray
Sale: $329.00MSRP: $399.00Grid Defense 16" 9mm Stainless Steel Upper Receiver - Tungsten Gray Milspec 7075-T6 Upper Receiver Finished in Tungsten Gray Cerakote 16" 416R Stainless Steel Barrel with 1:10 Twist Rate 1/2x36 Thread Pattern 14" Grid Defense Octagon M-Lok...Sale: $329.00MSRP: $399.00 -
Grid Defense 18" .308 Winchester Billet Upper - Blue Titanium
Sale: $439.00MSRP: $579.00Grid Defense 18" .308 Winchester Billet Upper - Blue Titanium Billet DPMS Pattern High Profile Upper Receiver 18" 4150 Chrome Moly Barrel Rifle Length Gas System Chambered in .308 Winchester 1:10 Twist Rate 5/8x24 TPI Thread Pitch Axe...Sale: $439.00MSRP: $579.00 -
Grid Defense 18" 6.5 Grendel Upper Receiver - Black
Sale: $349.00MSRP: $419.00Grid Defense 18" 6.5 Grendel Upper Receiver - Black Hard Coat Black Anodized Chambered in 6.5 Grendel 14" Free Float M-Lok Rail 18" 4150 Barrel - Black Nitride 1:8 Twist Rate Mid Length Gas System 5/8x24 Thread Pitch A2 Flash Hider Mil-Spec...Sale: $349.00MSRP: $419.00 -
Grid Defense 18" 6mm ARC Upper Receiver - Black
Sale: $349.00MSRP: $419.00Grid Defense 18" 6mm ARC Upper Receiver - Black Hard Coat Black Anodized Chambered in 6mm ARC 14" Free Float M-Lok Rail 18" 4150 Heavy Profile Barrel - Black Nitride 1:8 Twist Rate .750 Mid Length Gas System 5/8x24 Thread Pitch A2 Flash...Sale: $349.00MSRP: $419.00 -
Grid Defense 18" 6mm ARC Upper Receiver - Blue Titanium
Sale: $349.00MSRP: $419.00Grid Defense 18" 6mm ARC Upper Receiver - Blue Titanium Finished in Blue Titanium Cerakote Chambered in 6mm ARC 14" Free Float M-Lok Rail 18" 4150 Heavy Profile Barrel - Black Nitride 1:8 Twist Rate .750 Mid Length Gas System 5/8x24 Thread...Sale: $349.00MSRP: $419.00 -
Grid Defense 18" 6mm ARC Upper Receiver - Burnt Bronze
Sale: $349.00MSRP: $419.00Grid Defense 18" 6mm ARC Upper Receiver - Burnt Bronze Finished in Burnt Bronze Cerakote Chambered in 6mm ARC 14" Free Float M-Lok Rail 18" 4150 Heavy Profile Barrel - Black Nitride 1:8 Twist Rate .750 Mid Length Gas System 5/8x24 Thread...Sale: $349.00MSRP: $419.00 -
Grid Defense 18" 6mm ARC Upper Receiver - FDE
Sale: $349.00MSRP: $419.00Grid Defense 18" 6mm ARC Upper Receiver - FDE Finished in FDE Cerakote Chambered in 6mm ARC 14" Free Float M-Lok Rail 18" 4150 Heavy Profile Barrel - Black Nitride 1:8 Twist Rate .750 Mid Length Gas System 5/8x24 Thread Pitch A2 Flash...Sale: $349.00MSRP: $419.00 -
Grid Defense 18" 6mm ARC Upper Receiver - OD Green
Sale: $349.00MSRP: $419.00Grid Defense 18" 6mm ARC Upper Receiver - OD Green Finished in OD Green Cerakote Chambered in 6mm ARC 14" Free Float M-Lok Rail 18" 4150 Heavy Profile Barrel - Black Nitride 1:8 Twist Rate .750 Mid Length Gas System 5/8x24 Thread Pitch A2 Flash...Sale: $349.00MSRP: $419.00 -
Grid Defense 18" 6mm ARC Upper Receiver - Tungsten Gray
Sale: $349.00MSRP: $419.00Grid Defense 18" 6mm ARC Upper Receiver - Tungsten Gray Finished in Tungsten Gray Cerakote Chambered in 6mm ARC 14" Free Float M-Lok Rail 18" 4150 Heavy Profile Barrel - Black Nitride 1:8 Twist Rate .750 Mid Length Gas System 5/8x24 Thread...Sale: $349.00MSRP: $419.00 -
Grid Defense 20" .308 Winchester Billet Upper - Blue Titanium
Sale: $449.00MSRP: $589.00Grid Defense 20" .308 Upper Receiver - Blue Titanium DPMS Pattern upper 20" 4150 Chrome Moly Barrel Rifle Gas System Chambered in .308 Winchester 1:10 Twist Rate 5/8x24 Thread Pattern Axe Brake Muzzle Device 15" M-LOK Free Floating...Sale: $449.00MSRP: $589.00 -
Grid Defense 20" 350 Legend Upper Receiver - Blue Titanium
Sale: $349.00MSRP: $419.00Grid Defense 20" 350 Legend Upper Receiver - Blue Titanium Blue Titanium Cerakote Finish Chambered in 350 Legend A2 Flash Hider 20" 1:16 Twist 4150 Barrel - Black Nitride Carbine Length Gas System 5/8x24 Thread Pitch Grid Defense 14" M-Lok Free...Sale: $349.00MSRP: $419.00 -
Grid Defense 20" 350 Legend Upper Receiver - Burnt Bronze
Sale: $349.00MSRP: $419.00Grid Defense 20" 350 Legend Upper Receiver - Burnt Bronze Burnt Bronze Cerakote Finish Chambered in 350 Legend A2 Flash Hider 20" 1:16 Twist 4150 Barrel - Black Nitride Carbine Length Gas System Grid Defense 14" M-Lok Free Float Hand Guard Grid...Sale: $349.00MSRP: $419.00 -
Grid Defense 20" 350 Legend Upper Receiver - Tungsten Gray
Sale: $349.00MSRP: $419.00Grid Defense 20" 350 Legend Upper Receiver - Tungsten Gray Tungsten Gray Cerakote Finish Chambered in 350 Legend A2 Flash Hider 20" 1:16 Twist 4150 Barrel - Black Nitride Carbine Length Gas System Grid Defense 18" M-Lok Free Float Hand...Sale: $349.00MSRP: $419.00 -
Grid Defense 7.5" 5.56 Flash Can Upper Receiver - Gold
Sale: $339.00MSRP: $409.00Grid Defense 7.5" 5.56 Flash Can Upper Receiver - Gold Finished in Cerakote FX Gold 5.56 Upper Receiver 7075-T6 Mil-Spec Upper Receiver 7.5" 1:7 Twist 4150 M4 Barrel - Black Nitride Chambered in 5.56x45 NATO 9" Octagon M-Lok Handguard Dimpled...Sale: $339.00MSRP: $409.00 -
Grid Defense 9" .22LR Flash Can Upper Receiver - Black
Sale: $299.00MSRP: $399.00Grid Defense 9" .22LR Flash Can Upper Receiver - Black Milspec 7075-T6 Upper Receiver 9" 4150 Black Nitride Barrel Pencil Lightweight Profile Barrel 1:16 Twist Rate 1/2x28 Thread Pattern 9" Grid Defense Octagon M-Lok Rail Hard Coat Black...Sale: $299.00MSRP: $399.00 -
Grid Defense 9" .22LR Flash Can Upper Receiver - Tungsten Gray
Sale: $329.00MSRP: $399.00Grid Defense 9" .22LR Flash Can Upper Receiver - Tungsten Gray Milspec 7075-T6 Upper Receiver 9" 4150 Black Nitride Barrel Pencil Lightweight Profile Barrel 1:16 Twist Rate 1/2x28 Thread Pattern 9" Grid Defense Octagon M-Lok Rail Finished in...Sale: $329.00MSRP: $399.00 -
Grid Defense 9" .22LR Upper Receiver - OD Green
Sale: $299.00MSRP: $379.00Grid Defense 9" .22LR Upper Receiver - OD Green Milspec 7075-T6 Upper Receiver 9" 4150 Black Nitride Barrel Pencil Lightweight Profile Barrel 1:16 Twist Rate 1/2x28 Thread Pattern 7" Grid Defense Octagon M-Lok Rail Finished in OD Green...Sale: $299.00MSRP: $379.00 -
Grid Defense HEX Stainless Steel 16" .223 Wylde Upper Receiver - Burnt Bronze
Sale: $339.00MSRP: $409.00Grid Defense HEX Stainless Steel 16" .223 Wylde Upper Receiver - Burnt Bronze Burnt Bronze Cerakote Finish Chambered in .223 Wylde 16" 416R Stainless Steel Barrel 1:8 Twist Rate 1/2x28 TPI Thread Pitch Black A2 Muzzle Device Carbine Length Gas...Sale: $339.00MSRP: $409.00 -
Grid Defense HEX Stainless Steel 16" .223 Wylde Upper Receiver - FDE
Sale: $339.00MSRP: $409.00Grid Defense HEX Stainless Steel 16" .223 Wylde Upper Receiver - FDE Flat Dark Earth Cerakote Finish Chambered in .223 Wylde 16" 416R Stainless Steel Barrel 1:8 Twist Rate 1/2x28 TPI Thread Pitch Black A2 Muzzle Device Carbine Length Gas...Sale: $339.00MSRP: $409.00