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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On Sale
Ghost 20" .308 Winchester Billet Rifle Kit - Black
Sale: $599.00MSRP: $729.00Ghost 20" .308 Winchester Billet Rifle Kit - Black Billet DPMS Pattern High Profile Upper 20" 4150 Chrome Moly HBAR Contour Barrel Rifle Gas System Chambered in .308 Winchester 1:10 Twist Rate 5/8x24 TPI Thread Pitch A2 Flash Hider 15"...Sale: $599.00MSRP: $729.00 -
GHOST FIREARMS 16" 5.56 WITH 14" M-LOK RAIL RIFLE KIT WITH MOE STOCK AND MOE+ GRIP- BLACK
$662.90GHOST FIREARMS 16" 5.56 RIFLE KIT Hard Coat Black Anodized Chambered in 5.56 NATO 16" 1:7 Twist 4150 M4 Black Nitride Barrel 14" Ghost Firearms Free Float M-LOK Rail A2 Muzzle Device Mil-Spec 7075-T6 Upper Receiver Mil-Spec Lower Parts...$662.90 -
On Sale
Ghost Vital 16" .300 Blackout With Black Upper and 14" FDE Rail
Sale: $254.00MSRP: $329.00Ghost Vital 16" Black Upper .300 Blackout With 14" FDE Rail - Black Chambered in .300 Blackout 16" 1:8 Twist 4150 Barrel Black Nitride Carbine Length Gas System Ghost Firearms 14" M-Lok Free Float Hand Guard Finished in Flat Dark...Sale: $254.00MSRP: $329.00 -
Out of stock
Ghost Vital 16" 5.56 Rifle Build Kit With Nickel Boron Lower Parts kit
$529.00Ghost Firearms Vital 16" Upper - Black Chambered in 5.56x45 NATO (5.56/.223) A2 Birdcage Flash Hider 16" 1:7 or 1:8 Twist 4150 M4 Barrel Black Nitride Carbine Length Gas System Ghost Firearms 11"...$529.00 -
On Sale
Grid Defense 18" 6mm ARC Upper Receiver - FDE
Sale: $329.00MSRP: $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: $329.00MSRP: $419.00 -
On Sale
Grid Defense 7.5" .300 Blackout Upper Receiver - Black
Sale: $299.00MSRP: $379.00Grid Defense 7.5" .300 Blackout Upper Receiver Hard Coat Black Anodized Finish Mil Spec 7075-T6 Upper Receiver 7.5" 1:8 Twist 4150 Light HBAR Barrel - Black Nitride 7" Grid Defense Octagon M-Lok Rail Pistol Length Gas System A2 Flash Hider...Sale: $299.00MSRP: $379.00 -
On Sale
US MILITARY 10.5" 5.56 NATO FLASH CAN UPPER RECEIVER WITH 12" JESTER RAIL - BLACK
Sale: $229.00MSRP: $299.00VETERAN'S DAY 10.5" 5.56 NATO FLASH CAN UPPER RECEIVER WITH 12" MLOK RAIL - BLACK Hard Coat Black Anodized Finish Mil-Spec AR15 Upper Receiver Mil-Spec Forward Assist Laser Engraved Dust Cover 12" Jester Free Float M-LOK Rail 10.5" 1:7...Sale: $229.00MSRP: $299.00 -
On Sale
ALWAYS ARMED 10.5" 300 BLACKOUT PISTOL KIT - MAGPUL FDE
Sale: $359.00MSRP: $499.00Always Armed 10.5" 300 Blackout Pistol Kit - Magpul FDE Made in the USA Mil-Spec Lower Parts Kit Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 10.5" 1:8 Twist 4150 Barrel with Black Nitride Finish Chambered in 300 Blackout...Sale: $359.00MSRP: $499.00 -
On Sale
ALWAYS ARMED 7.5" 300 BLACKOUT PISTOL KIT - MAGPUL FDE
Sale: $439.00MSRP: $499.00Always Armed 7.5" 300 Blackout Pistol Kit - Magpul FDE Made in the USA Mil-Spec Lower Parts Kit Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 7.5" 1:8 Twist 4150 Barrel with Black Nitride Finish Chambered in 300...Sale: $439.00MSRP: $499.00 -
On Sale
Ghost 7.5" 5.56 Stainless Steel Upper Receiver - Black
Sale: $229.00MSRP: $319.00Ghost 7.5" 5.56 Stainless Steel Upper Receiver - Black Chambered in 5.56x45 NATO (5.56/.223) A2 Birdcage Flash Hider 7.5" 1:7 Twist 416R Stainless Steel Barrel Pistol Length Gas System Ghost Firearms 7" M-Lok Free...Sale: $229.00MSRP: $319.00 -
On Sale
Ghost Firearms 5.5" 9mm Stainless Steel Flash Can Upper Receiver - Black
Sale: $259.00MSRP: $349.00Ghost Firearms 5.5" 9mm Stainless Steel Flash Can Upper - Black Chambered in 9mm 5.5" 1:10 Twist 416R Stainless Steel Barrel Smooth Flash Can Muzzle Device Hard Coat Black Anodized Finish 7" Free Float M-LOK Hand Rail Made in The...Sale: $259.00MSRP: $349.00 -
On Sale
Grid Defense 16" .22LR Upper Receiver - FDE
Sale: $329.00MSRP: $399.00Grid Defense 16" .22LR Upper Receiver - FDE Milspec 7075-T6 Upper Receiver 16" 4150 Black Nitride Barrel Pencil Lightweight Profile Barrel 1:16 Twist Rate 1/2x28 Thread Pattern 14" Grid Defense Octagon M-Lok Rail Flat Dark Earth Cerakote...Sale: $329.00MSRP: $399.00 -
On Sale
Grid Defense 9" .22LR Flash Can Upper Receiver - FDE
Sale: $329.00MSRP: $399.00Grid Defense 9" .22LR Flash Can Upper Receiver - FDE 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 Flat Dark Earth Cerakote Fluted...Sale: $329.00MSRP: $399.00 -
On Sale
Grid Defense Stainless Steel 10.5" 5.56 Upper Receiver - FDE
Sale: $299.00MSRP: $399.00Grid Defense Stainless Steel 10.5" 5.56 Upper Receiver Magpul Flat Dark Earth Cerakote Finish Chambered in 5.56 NATO Grid Defense Mil Spec 7075 T6 Upper Receiver Grid Defense 9" M-Lok Free Float Hand Guard Carbine Length Gas System 10.5" 1:7...Sale: $299.00MSRP: $399.00 -
On Sale
ALWAYS ARMED 10.5" 5.56 KEYMOD UPPER RECEIVER - FDE
Sale: $209.00MSRP: $299.00ALWAYS ARMED 10.5" 5.56 KEYMOD UPPER RECEIVER - FDE Made in the USA Finished in Flat Dark Earth Cerakote Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 10.5" 1:7 Twist 4150 Barrel with Black Nitride Finish Chambered in 5.56 NATO...Sale: $209.00MSRP: $299.00 -
On Sale
ALWAYS ARMED 10.5" 5.56 NATO BX SERIES PISTOL KIT - BLACK ANODIZED
Sale: $349.00MSRP: $479.00ALWAYS ARMED 10.5" 5.56 NATO BX SERIES PISTOL KIT Made in the USA Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 10.5" 1:7 Twist 4150 Barrel with Black Nitride Finish Chambered in 5.56 NATO Carbine Length Gas System .750 Low...Sale: $349.00MSRP: $479.00 -
On Sale
ALWAYS ARMED 10.5" 5.56 NATO PISTOL KIT - MAGPUL FDE
Sale: $359.00MSRP: $499.00Always Armed 10.5" 5.56 NATO Pistol Kit - Magpul FDE Made in the USA Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 10.5" 1:7 Twist 4150 Barrel with Black Nitride Finish Chambered in 5.56 NATO Carbine Length Gas System .750 Low...Sale: $359.00MSRP: $499.00 -
Out of stockOn Sale
ALWAYS ARMED 16" .308 WIN UPPER RECEIVER WITH 15" M-LOK - FDE
Sale: $329.00MSRP: $459.00ALWAYS ARMED 16" .308 WIN UPPER RECEIVER DPMS Pattern Upper Receiver 16" 4150 Chrome Moly HBAR Contour Barrel Mid Length Gas System Chambered in .308 Winchester 1:10 Twist Rate 5/8x24 Thread Pattern A2 Flash Hider 15" M-LOK Free Floating Rail Magpul FDE...Sale: $329.00MSRP: $459.00 -
Out of stockOn Sale
ALWAYS ARMED 16" 9MM STAINLESS STEEL UPPER RECEIVER WITH 15" KEYMOD HAND GUARD - BLACK
Sale: $209.00MSRP: $279.00Always Armed 16" 9MM Stainless Steel Upper Receiver With 15" Keymod Hand Guard Made in the USA Mil-Spec Upper Receiver with Dust Cover and Forward Assist 16" 416R Stainless Steel Barrel Chambered in 9x19 PARA 15" Free Floating Key Mod Hand Guard Black...Sale: $209.00MSRP: $279.00 -
Out of stock
ALWAYS ARMED 7.5" .300 BLACKOUT STAINLESS STEEL UPPER RECEIVER WITH SS AXE BRAKE- BLACK
$329.00ALWAYS ARMED 7.5" .300 BLACKOUT STAINLESS STEEL UPPER RECEIVER WITH SS AXE BRAKE- BLACK Made in the USA Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 7.5" 1:8 Twist 416R Stainless Steel Barrel Chambered in .300 Blackout Pistol...$329.00