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 stock
ALWAYS ARMED 4.5" 9MM FLASH CAN UPPER RECEIVER - BLACK ANODIZED
$269.00ALWAYS ARMED 4.5" 9MM FLASH CAN UPPER RECEIVER Made in the USA Mil Spec AR15 Upper Receiver 4.5" 1:10 Twist Barrel with Black Nitride Finish 5.5" Free Float M-LOK Rail Flash Can Muzzle Device Hard Coat Black Anodized Finish$269.00 -
Ghost IHS 5" Upper 5.56 Nato
$239.00 - $259.00Ghost IHS 5" 5.56 Upper Hard Coat Black Anodized Finish Chambered in 5.56x45 NATO (5.56/.223) A2 Flash Hider 5" 1:5 Twist 4150 Chrome Moly Vanadium Barrel 1/2x28 Thread Pitch Micro Length Gas System Ghost 4.25" Integral Hand...$239.00 - $259.00 -
Ghost IHS 5" Upper .300 Blackout
$219.00 - $239.00Ghost IHS 5" .300 Blackout Upper Receiver Hard Coat Black Anodized Finish Chambered in .300 Blackout A2 Flash Hider 5" 1:5 Twist 4150 Chrome Moly Vanadium Barrel 5/8x24 Thread Pitch Micro Length Gas System Ghost 4.25" Integral...$219.00 - $239.00 -
On Sale
ALWAYS ARMED 4.5" 9MM TR SERIES UPPER RECEIVER - BLACK
Sale: $179.00MSRP: $269.00ALWAYS ARMED 4.5" 9MM TR SERIES UPPER RECEIVER - BLACK Made in the USA Mil Spec AR15 Upper Receiver 4.5" 1:10 Twist Barrel with Black Nitride Finish 4" TR Series Free Float M-LOK Handguard A2 Muzzle Device Hard Coat Black Anodized FinishSale: $179.00MSRP: $269.00 -
Out of stockOn Sale
ALWAYS ARMED 4.5" 9MM TR SERIES FLASH CAN COMPLETE UPPER RECEIVER WITH BCG CH - BLACK
Sale: $279.00MSRP: $427.00ALWAYS ARMED 4.5" 9MM TR SERIES FLASH CAN COMPLETE UPPER RECEIVER WITH BCG CH - BLACK Made in the USA Mil Spec AR15 9mm Flash Can Upper Receiver 4.5" 1:10 Twist Barrel with Black Nitride Finish 4" TR Series Free Float M-LOK Rail Flash...Sale: $279.00MSRP: $427.00 -
Ghost IHS 5" 5.56 Pistol Kit
$419.00 - $439.00Ghost IHS 5" 5.56 Pistol Kit Chambered in 5.56x45 NATO (5.56/.223) A2 Birdcage Flash Hider 5" 1:5 Twist 4150 M4 Barrel Black Nitride Micro Length Gas System Ghost Firearms 4.25" IHS M-Lok Free Float Hand Guard Ghost...$419.00 - $439.00 -
Ghost Suppressor Ready IHS 5" .300 Blackout Upper Receiver
$259.00 - $279.00Ghost Suppressor Ready IHS 5.5" .300 Blackout Upper Upper Specifications Mil-Spec Upper Receiver Machined from 7075-T6 Forging Mil-Spec dust cover and forward assist Made in the USA 4.25" Free Float IHS "Intergral Hand Stop" Handguard...$259.00 - $279.00 -
On Sale
ALWAYS ARMED 4.5" 9MM FLASH CAN UPPER RECEIVER WITH 4" TR RAIL - BLACK ANODIZED
Sale: $189.00MSRP: $269.00ALWAYS ARMED 4.5" 9MM FLASH CAN UPPER RECEIVER WITH 4" TR RAIL - BLACK ANODIZED Made in the USA Mil Spec AR15 9mm Flash Can Upper Receiver 4.5" 1:10 Twist Barrel with Black Nitride Finish 4" TR Series Free Float M-LOK Rail Flash...Sale: $189.00MSRP: $269.00 -
On Sale
ALWAYS ARMED 4.5" 9MM OCTO GEN 2 FLASH CAN UPPER RECEIVER - ZOMBIE GREEN
Sale: $219.00MSRP: $299.00ALWAYS ARMED 4.5" 9MM OCTO GEN 2 FLASH CAN UPPER RECEIVER - ZOMBIE GREEN Made in the USA Mil Spec AR15 Upper Receiver 4.5" 1:10 Twist Barrel with Black Nitride Finish 4.25" Free Float M-LOK Rail Flash Can Muzzle Device Zombie Green Cerakote FinishSale: $219.00MSRP: $299.00 -
On Sale
ALWAYS ARMED 4.5" .22LR TRX SERIES UPPER RECEIVER - BLACK
Sale: $219.00MSRP: $399.00ALWAYS ARMED 4.5" .22LR TRX SERIES UPPER RECEIVER - BLACK Chambered in .22LR Hard Coat Black Anodized Finish Made In The USA 4.5" 1:16 Twist 4140 CrMo Barrel Salt bath nitride finished barrel 1/2"-28 TPI Medium taper barrel profile 4.25" TRX...Sale: $219.00MSRP: $399.00 -
Out of stockOn Sale
Always Armed 4.5" 9MM Gen2 Flash Can Pistol Kit - Titanium
Sale: $414.00MSRP: $499.00Always Armed 4.5" 9MM Gen2 Flash Can Pistol Kit - Titanium Titanium Cerakote Finish Chambered in 9mm 9mm Bolt Carrier Group (Colt and Glock cut) Mil-spec Charging Handle A2 Flash Hider 4.5" 1:10 Twist 4150 Chrome Moly Steel Barrel...Sale: $414.00MSRP: $499.00 -
On Sale
ALWAYS ARMED 4.5" 9MM OCTO GEN 2 FLASH CAN UPPER RECEIVER - FDE
Sale: $239.00MSRP: $299.00ALWAYS ARMED 4.5" 9MM OCTO GEN 2 FLASH CAN UPPER RECEIVER Made in the USA Mil Spec AR15 Upper Receiver 4.5" 1:10 Twist Barrel with Black Nitride Finish 4.25" Free Float M-LOK Rail Flash Can Muzzle Device Magpul FDE Cerakote FinishSale: $239.00MSRP: $299.00 -
On Sale
ALWAYS ARMED 4.5" 9MM OCTO GEN 2 FLASH CAN UPPER RECEIVER - TUNGSTEN GRAY
Sale: $219.00MSRP: $299.00ALWAYS ARMED 4.5" 9MM OCTO GEN 2 FLASH CAN UPPER RECEIVER Made in the USA Mil Spec AR15 Upper Receiver 4.5" 1:10 Twist Barrel with Black Nitride Finish 4.25" Free Float M-LOK Rail Flash Can Muzzle Device Tungsten Gray Cerakote FinishSale: $219.00MSRP: $299.00 -
GHOST IHS 4.5" .22LR UPPER RECEIVER
$249.00 - $269.00GHOST IHS 4.5" .22LR UPPER RECEIVER Chambered in .22LR Hard Coat Black Anodized Finish Made In The USA 4.5" 1:16 Twist 4140 CrMo Barrel 1/2"-28 TPI Medium taper barrel profile 4.25" Ghost IHS (Integral Hand Stop) M-LOK Hand Rail Flash Can...$249.00 - $269.00 -
Ghost Suppressor Ready IHS 5" 5.56 NATO Upper Receiver
$259.00 - $279.00Ghost Suppressor Ready IHS 5.5" 5.56 NATO Upper Upper Specifications Mil-Spec Upper Receiver Machined from 7075-T6 Forging Mil-Spec dust cover and forward assist Made in the USA 4.25" Free Float IHS "Intergral Hand Stop" Handguard...$259.00 - $279.00 -
On Sale
Always Armed 4.5" 9MM Gen2 Flash Can Pistol Kit - Zombie Green
Sale: $414.00MSRP: $499.00Always Armed 4.5" 9MM Gen2 Flash Can Pistol Kit - Zombie Green Zombie Green Cerakote Finish Chambered in 9mm 9mm Bolt Carrier Group (Colt and Glock cut) Mil-spec Charging Handle A2 Flash Hider 4.5" 1:10 Twist 4150 Chrome Moly Steel...Sale: $414.00MSRP: $499.00 -
Ghost Firearms IHS 4.5" 9mm Blast Can Upper
$249.00 - $269.00Ghost Firearms IHS 4.5" Blast Can Upper 9MM Chambered in 9x19MM Para Stubby Blast Can Muzzle Device 4.5" 1:10 Twist 4150 Light HBar Barrel Black Nitride 1/2x36 Thread Pattern Ghost Firearms 4.25" M-Lok Free Float Handguard IHS...$249.00 - $269.00 -
On Sale
Ghost IHS 5" 5.56 NATO Upper Receiver - Gold
Sale: $269.00MSRP: $339.00Ghost IHS 5" 5.56 Upper - Gold Cerakote FX Gold Upper Receiver Chambered in 5.56x45 NATO (5.56/.223) A2 Flash Hider 5" 1:5 Twist 4150 Chrome Moly Vanadium Barrel 1/2x28 Thread Pitch Micro Length Gas System Ghost 4.25" Integral...Sale: $269.00MSRP: $339.00 -
On Sale
Always Armed 4.5" 9MM Gen2 Flash Can Pistol Kit - FDE
Sale: $414.00MSRP: $499.00Always Armed 4.5" 9MM Gen2 Flash Can Pistol Kit - FDE Magpul Flat Dark Earth Cerakote Finish Chambered in 9mm 9mm Bolt Carrier Group (Colt and Glock cut) Mil-spec Charging Handle A2 Flash Hider 4.5" 1:10 Twist 4150 Chrome Moly Steel Barrel...Sale: $414.00MSRP: $499.00 -
On Sale
ALWAYS ARMED 4.5" 9MM OCTO GEN 2 FLASH CAN UPPER RECEIVER - OD GREEN
Sale: $219.00MSRP: $299.00ALWAYS ARMED 4.5" 9MM OCTO GEN 2 FLASH CAN UPPER RECEIVER Made in the USA Mil Spec AR15 Upper Receiver 4.5" 1:10 Twist Barrel with Black Nitride Finish 4.25" Free Float M-LOK Rail Flash Can Muzzle Device Magpul OD Green Cerakote FinishSale: $219.00MSRP: $299.00