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 -
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 -
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" .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