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
ALWAYS ARMED 5.5" 9MM STAINLESS STEEL TR SERIES UPPER RECEIVER WITH 4" RAIL - BLACK
Sale: $189.00MSRP: $269.00ALWAYS ARMED 5.5" 9MM SS TR SERIES UPPER RECEIVER WITH 4" RAIL - BLACK Made in the USA Mil Spec AR15 Upper Receiver 5.5" 1:10 Twist 416R Stainless Steel Barrel 4" Free Float M-LOK Rail Flash Can Muzzle Device Hard Coat Black Anodized...Sale: $189.00MSRP: $269.00 -
On Sale
ALWAYS ARMED 10.5" 5.56 NATO PISTOL KIT - BLACK ANODIZED
Sale: $339.00MSRP: $479.00Always Armed 10.5" 5.56 NATO Pistol Kit - Black Anodized 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...Sale: $339.00MSRP: $479.00 -
On Sale
ALWAYS ARMED 16" 5.56 NATO TR SERIES WITH TRINITY FORCE SIGHTS RIFLE KIT - BLACK ANODIZED
Sale: $349.00MSRP: $519.00Always Armed 16" 5.56 NATO TRX With Trinity Force Sights Rifle Kit - Black Anodized 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...Sale: $349.00MSRP: $519.00 -
On Sale
ALWAYS ARMED 7.5" 300 BLACKOUT PISTOL KIT - BLACK ANODIZED
Sale: $339.00MSRP: $459.00Always Armed 7.5" 300 Blackout Pistol Kit - Black Anodized 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 Blackout...Sale: $339.00MSRP: $459.00 -
On Sale
ALWAYS ARMED 7.5" 5.56 NATO STAINLESS STEEL UPPER RECEIVER - BLACK ANODIZED
Sale: $179.00MSRP: $279.00ALWAYS ARMED 7.5" 5.56 NATO STAINLESS STEEL UPPER RECEIVER - BLACK ANODIZED Made in the USA Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 7.5" 1:7 Twist 416R Stainless Steel Barrel Chambered in 5.56 NATO Pistol Length...Sale: $179.00MSRP: $279.00 -
On Sale
Ghost Firearms Vital 16" 9mm Upper Receiver - Black
Sale: $224.00MSRP: $299.00Ghost Firearms Vital 16" 9MM Upper - Black Chambered in 9x19 Para A2 Birdcage Flash Hider 1/2x36 Thread Pattern 16" 1:10 Twist 4150 Light HBar Barrel Black Nitride Ghost Firearms 11" M-Lok Free Float Hand Guard Ghost Mil-Spec...Sale: $224.00MSRP: $299.00 -
On Sale
Ghost Firearms 7.5" 5.56 Flash Can Upper Receiver Pistol Kit - Black Anodized
Sale: $449.00MSRP: $599.00Ghost Firearms 7.5" Flash Can Upper Receiver Pistol Build Kit The new AR15 build kits with Mil-Spec complete upper receiver and flash can. Hard Coat Black Anodized Finish Milspec 7075-T6 Upper Receiver 7.5" 1:7 4150 M4 Barrel - Black Nitride...Sale: $449.00MSRP: $599.00 -
On Sale
ALWAYS ARMED 10.5" 7.62X39 BX SERIES UPPER RECEIVER - BLACK ANODIZED
Sale: $189.00MSRP: $279.00ALWAYS ARMED 10.5" 7.62X39 BX SERIES UPPER RECEIVER 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 Low...Sale: $189.00MSRP: $279.00 -
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 -
On Sale
ALWAYS ARMED OCTO SERIES 16" 5.56 NATO RIFLE KIT - BLACK
Sale: $349.00MSRP: $469.00ALWAYS ARMED OCTO SERIES 16" 5.56 NATO 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 -
Out of stockOn Sale
Andro Corp 10.5" 5.56 Front Sight Upper Receiver - Black
Sale: $180.00MSRP: $429.00Andro Corp 10.5" 5.56 Front Sight Upper Receiver - Black Made in the USA 10.5" 5.56 NATO Barrel 1:8 Twist Rate 1/2x28 TPI Thread Pitch 7075-T6 Mil-Spec Upper Receiver M4 Handguard Carbine Length Gas System A2 Muzzle Device Black Anodized Mil...Sale: $180.00MSRP: $429.00 -
On Sale
ALWAYS ARMED 16" 5.56 NATO UPPER RECEIVER WITH 12" M-LOK RAIL, POP UP SIGHTS AND ANGLED FOREGRIP
Sale: $249.00MSRP: $329.00ALWAYS ARMED 16" 5.56 NATO UPPER RECEIVER WITH 12" M-LOK RAIL, POP UP SIGHTS AND ANGLED FOREGRIP Made in the USA Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 16" 1:7 Twist 4150 Steel Barrel Chambered in 5.56...Sale: $249.00MSRP: $329.00 -
On Sale
Ghost 16" 9MM Rifle Kit - Black
Sale: $439.00MSRP: $689.00GHOST 16" 9MM RIFLE KIT Hard Coat Black Anodized 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 Receiver Mil-Spec...Sale: $439.00MSRP: $689.00 -
On Sale
ALWAYS ARMED 5.5" 9MM OCTO GEN 2 UPPER RECEIVER WITH STAINLESS STEEL BARREL - BLACK
Sale: $219.00MSRP: $299.00ALWAYS ARMED 5.5" 9MM OCTO GEN 2 FLASH CAN UPPER RECEIVER Made in the USA Mil Spec AR15 Upper Receiver 5.5" 1:10 Twist 416R Stainless Steel Barrel 4.25" Free Float M-LOK Rail Flash Can Muzzle Device Hard Coat Black Anodized FinishSale: $219.00MSRP: $299.00 -
On Sale
GRID DEFENSE 10.5" .300 BLACKOUT UPPER RECEIVER - BLACK
Sale: $299.00MSRP: $379.00Grid Defense 10.5" 300 Blackout Upper Receiver Hard Coat Black Anodized Chambered in 300 Blackout (7.62x35) 7075-T6 Milspec Upper Receiver 10.5" 1:8 Twist 4150 Steel Light HBar Barrel - Black Nitride .750 Low Profile Gas Block Pistol Length Gas System...Sale: $299.00MSRP: $379.00 -
On Sale
ALWAYS ARMED 6" .300 BLACKOUT UPPER RECEIVER - BLACK ANODIZED
Sale: $187.78MSRP: $269.00ALWAYS ARMED 6" 300 BLACKOUT UPPER RECEIVER - BLACK ANODIZED Made in the USA Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 6" 1:7 Twist 4150 Barrel with Black Nitride Finish Chambered in .300 Blackout Pistol Length Gas...Sale: $187.78MSRP: $269.00 -
On Sale
ALWAYS ARMED 7.5" 7.62x29 BX SERIES FLASH CAN UPPER RECEIVER - BLACK
Sale: $209.00MSRP: $299.00ALWAYS ARMED 7.5" 7.62x29 BX SERIES FLASH CAN UPPER RECEIVER - BLACK Hard Coat Black Anodized Finish Mil-Spec AR15 Upper Receiver with Dust Cover and Forward Assist 9" BX Series Free Float M-LOK Rail 7.5" 1:10 Twist 4150 Barrel with Black Nitride Finish...Sale: $209.00MSRP: $299.00 -
Out of stockOn Sale
ALWAYS ARMED OCT2 SERIES 16" 5.56 NATO RIFLE KIT - BLACK
Sale: $349.00MSRP: $469.00ALWAYS ARMED OCT2 SERIES 16" 5.56 NATO 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
Ghost Vital 7.5" Upper 5.56 Nato With Stainless Steel Barrel with BCG and Charging Handle
Sale: $259.00MSRP: $399.00Ghost Firearms Vital 7.5" Upper Chambered in 5.56x45 NATO (5.56/.223) A2 Birdcage Flash Hider (Black) 7.5" 1:7 Twist 416R M4 Stainless Steel Barrel Pistol Length Gas System Ghost Firearms 7" M-Lok Free Float Hand...Sale: $259.00MSRP: $399.00 -
On Sale
ALWAYS ARMED 16" 300 BLACKOUT RIFLE KIT - BLACK ANODIZED
Sale: $349.00MSRP: $469.00Always Armed 16" 300 Blackout Rifle Kit - Black Anodized Made in the USA Mil-Spec Lower Parts Kit Carbine Buffer Tube Assembly Rifle Butt Stock Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 16" 1:8 Twist 4150 Barrel with Black...Sale: $349.00MSRP: $469.00