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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Out of stockOn Sale
Ghost Firearms 16" 9MM Rifle Kit - Blue Titanium
Sale: $399.00MSRP: $729.00GHOST FIREARMS 16" 9MM RIFLE KIT Finished in Blue Titanium Cerakote Chambered in 9x19 Para 16" 1:10 Twist 4150 Light HBar Black Nitride Barrel 1/2x36 Thread Pattern 14" Ghost Firearms Free Float M-LOK Rail A2 Muzzle Device Mil-Spec 7075-T6 Upper...Sale: $399.00MSRP: $729.00 -
Out of stockOn Sale
Ghost Firearms 16" 9MM Rifle Kit - Tungsten Gray
Sale: $399.00MSRP: $729.00GHOST FIREARMS 16" 9MM RIFLE KIT Finished in Tungsten Gray Cerakote Chambered in 9x19 Para 1/2x36 Thread Pattern 16" 1:10 Twist 4150 Light HBar Black Nitride Barrel 14" Ghost Firearms Free Float M-LOK Rail A2 Muzzle Device Mil-Spec 7075-T6 Upper...Sale: $399.00MSRP: $729.00 -
On Sale
Grid Defense 10.5" .300 Blackout Upper Receiver - Burnt Bronze
Sale: $299.00MSRP: $379.00Grid Defense 10.5" .300 Blackout Upper Receiver - Burnt Bronze Finished in Burnt Bronze Cerakote Mil-Spec 7075-T6 Upper Receiver 10.5" 1:8 Twist 4150 Steel Barrel - Black Nitride Chambered in .300 Blackout (7.62x35) A2 Muzzle Device Pistol Length Gas...Sale: $299.00MSRP: $379.00 -
On Sale
Grid Defense 16" 300 Blackout Upper Receiver - Tungsten Gray
Sale: $329.00MSRP: $399.00Grid Defense 16" 300 Blackout Upper Receiver - Tungsten Gray Tungsten Gray Cerakote Finish Chambered in .300 Blackout (7.62x35) A2 Flash Hider 16" 1:8 Twist 4150 Light HBar Barrel - Black Nitride Pistol Length Gas System Grid Defense 14" M-Lok Free...Sale: $329.00MSRP: $399.00 -
On Sale
GRID DEFENSE 16" 9MM UPPER RECEIVER - BLACK
Sale: $329.00MSRP: $399.00Grid Defense 16" 9MM Upper Receiver - Black Hard Coat Black Anodized Chambered in 9x19 Para Grid Defense 14" M-Lok Rail 16" 1:10 4150 Light HBar Barrel - Black Nitride 1/2x36 Thread Pattern A2 Flash Hider Mil-Spec 7075-T6 Upper ReceiverSale: $329.00MSRP: $399.00 -
On Sale
ALWAYS ARMED 10.5" 7.62X39 UPPER RECEIVER - BURNT BRONZE
Sale: $209.00MSRP: $299.00Always Armed 10.5" 7.62X39 Upper Receiver - Burnt Bronze Made in the USA Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 10.5" 1:10 Twist 4150 Barrel with Black Nitride Finish Chambered in 7.62X39 Carbine Length Gas System .750...Sale: $209.00MSRP: $299.00 -
On Sale
ALWAYS ARMED 16" 5.56 NATO TR RIFLE KIT - BLACK
Sale: $349.00MSRP: $469.00ALWAYS ARMED 16" 5.56 NATO TRX RIFLE KIT Made in the USA Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 16" 1:7 Twist 4150 Barrel with Black Nitride Finish Chambered in 5.56 NATO Carbine Length Gas System .750 Low...Sale: $349.00MSRP: $469.00 -
On Sale
ALWAYS ARMED 16" 5.56 NATO UPPER RECEIVER WITH 15" M-LOK QUAD RAIL - BURNT BRONZE
Sale: $219.00MSRP: $299.00ALWAYS ARMED 16" 5.56 NATO UPPER RECEIVER WITH 15" M-LOK QUAD RAIL - BURNT BRONZE Made in the USA 16" 4150 Barrel Chambered in 5.56 NATO 15" Free Floating MLOK Quad Rail Burnt Bronze Cerakote Finish Carbine Length Gas System A2 Muzzle Device 1:7...Sale: $219.00MSRP: $299.00 -
Out of stockOn Sale
ALWAYS ARMED Jester 16" 5.56 NATO UPPER RECEIVER - BLACK
Sale: $199.00MSRP: $299.00ALWAYS ARMED JESTER 16" 5.56 NATO UPPER RECEIVER Made in the USA Mil-Spec 7075 T6 5.56 Nato Upper Receiver with Dust Cover and Forward Assist 16" 1:7 Twist 4150 Barrel with Black Nitride Finish Chambered in 5.56 NATO Carbine Length...Sale: $199.00MSRP: $299.00 -
Out of stockOn Sale
Ghost Firearms 16" 9MM Rifle Kit - FDE
Sale: $399.00MSRP: $729.00GHOST FIREARMS 16" 9MM RIFLE KIT Finished in Magpul Flat Dark Earth Cerakote Chambered in 9x19 Para 16" 1:10 Twist 4150 Light HBar Black Nitride Barrel 1/2x36 Thread Pattern 14" Ghost Firearms Free Float M-LOK Rail A2 Muzzle Device Mil-Spec 7075-T6...Sale: $399.00MSRP: $729.00 -
On Sale
GHOST FIREARMS 7.5" STAINLESS STEEL 9MM FLASH CAN UPPER RECEIVER - BLACK
Sale: $249.00MSRP: $329.00GHOST FIREARMS 7.5" STAINLESS STEEL 9MM FLASH CAN UPPER RECEIVER - BLACK 7.5" 416R Stainless Steel Barrel 1/2x36 Thread Pattern Chambered in 9x19 Parabellum Gas System Type Blowback 9" M-LOK Free Float Rail Flash Can Twist...Sale: $249.00MSRP: $329.00 -
On Sale
ALWAYS ARMED 16" 7.62X39 UPPER RECEIVER - BLACK ANODIZED
Sale: $199.00MSRP: $299.00Always Armed 16" 7.62X39 Upper Receiver - Black Anodized Made in the USA Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 16" 1:10 Twist 4150 Barrel with Black Nitride Finish Chambered in 7.62X39 Carbine Length Gas System .750...Sale: $199.00MSRP: $299.00 -
On Sale
ALWAYS ARMED TR SERIES 16" 9MM STAINLESS STEEL UPPER RECEIVER - BLACK
Sale: $209.00MSRP: $339.00ALWAYS ARMED 16" 9MM UPPER RECEIVER Made in the USA 16" 416R Stainless Steel Barrel Chambered in 9X19 Para 15" Free Floating MLOK Rail Black Anodized Finish A2 Muzzle Device - Black Nitride Finish 1:10 Twist Rate BCG and Charging Handle are NOT...Sale: $209.00MSRP: $339.00 -
On Sale
GHOST 16" .308 WINCHESTER UPPER RECEIVER WITH 12" M-LOK RAIL - BLACK
Sale: $319.00MSRP: $449.00GHOST 16" .308 WINCHESTER UPPER RECEIVER WITH 12" M-LOK RAIL - BLACK DPMS Pattern Upper (Low Profile) Mil-Spec Dust Cover and Forward Assist 16" 4150 HBAR Contour Barrel - Black Nitride Mid-length gas system Chambered in .308 Winchester with a 1:10...Sale: $319.00MSRP: $449.00 -
On Sale
Ghost Firearms 7.5" 9mm Flash Can Upper Receiver - Black
Sale: $279.00MSRP: $329.00Ghost Firearms 7.5" 9mm Flash Can Upper Receiver - Black Proudly Made in the USA Chambered in 9mm 7075 T6 Forged Aluminum Mil-Spec AR15 Upper Receiver 7.5" 1:10 Twist 4150 Barrel 1/2x36 Thread Pattern Flash Can Muzzle Device 9" Ghost Firearms...Sale: $279.00MSRP: $329.00 -
On Sale
Grid Defense 16" 5.56 Quad Rail Upper Receiver - Blue Titanium
Sale: $329.00MSRP: $399.00Grid Defense 16" 5.56 Quad Rail Upper Receiver - Blue Titanium Blue Titanium Cerakote Finish Chambered in 5.56x45 NATO 14" M-Lok Quad Rail 16" 1:7 4150 M4 Barrel - Black Nitride Carbine Length Gas System A2 Flash Hider Mil-Spec 7075-T6 Upper ReceiverSale: $329.00MSRP: $399.00 -
On Sale
Grid Defense 16" 7.62x39 Upper Receiver - Tungsten Gray
Sale: $329.00MSRP: $399.00Grid Defense 16" Upper Receiver Finished in Tungsten Gray Cerakote Chambered in 7.62x39 16" 1:10 Twist 4150 Light HBar Barrel - Black Nitride A2 Muzzle Device 14" Free Floating M-Lok Rail Milspec 7075-T6 Upper Receiver Carbine Gas System Made in the USA...Sale: $329.00MSRP: $399.00 -
On Sale
GRID DEFENSE 7.5" 9MM FLASH CAN UPPER RECEIVER - ZOMBIE GREEN
Sale: $329.00MSRP: $399.00GRID DEFENSE 7.5" 9MM FLASH CAN UPPER RECEIVER - ZOMBIE GREEN Zombie Green Cerakote Finish Mil Spec 7075-T6 Upper Receiver 7.5" 1:10 Twist 4150 Light HBar Barrel - Black Nitride (1/2x36 Thread Pattern) 9" Grid Defense Octagon M-Lok Rail Dimpled Flash...Sale: $329.00MSRP: $399.00 -
On Sale
GRID DEFENSE 7.5" 9MM UPPER RECEIVER - BLACK
Sale: $299.00MSRP: $379.00Grid Defense 7.5" 9mm Upper Receiver Hard Coat Black Anodized Mil Spec 7075-T6 Upper Receiver 7.5" 1:10 Twist 4150 Light HBar Barrel - Black Nitride 7" Grid Defense Octagon M-Lok Rail A2 Flash Hider - 1/2x36 Thread Pattern Chambered in 9x19...Sale: $299.00MSRP: $379.00 -
Out of stock
7.5" 5.56 NATO COMPLETE UPPER RECEIVER WITH 7" KEYMOD RAIL, BCG, CHARGING HANDLE & SIGHTS - FDE
$429.007.5" 5.56 NATO COMPLETE UPPER RECEIVER WITH 7" KEYMOD RAIL, BCG, CHARGING HANDLE & SIGHTS Made in the USA Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 7.5" 1:7 Twist 4150 Black Nitride Barrel Chambered in 5.56 NATO A2...$429.00