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
ALWAYS ARMED 16" 5.56 NATO UPPER RECEIVER - SIG PINK
Sale: $219.00MSRP: $319.00Always Armed 16" 5.56 NATO Upper Receiver - Sig Pink 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 Pink AR 15 Upper Receiver Chambered in 5.56 NATO Carbine...Sale: $219.00MSRP: $319.00 -
On Sale
ALWAYS ARMED 16" 5.56 NATO RIFLE KIT - SIG PINK
Sale: $379.00MSRP: $529.00Always Armed 16" 5.56 NATO Rifle Kit - Sig Pink Made in the USA Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 16" 1:7 or 1:8 Twist 4150 Barrel with Black Nitride Finish Chambered in 5.56 NATO Carbine Length Gas System ...Sale: $379.00MSRP: $529.00 -
On Sale
ALWAYS ARMED 10.5" 5.56 NATO UPPER RECEIVER - SIG PINK
Sale: $209.00MSRP: $299.00Always Armed 10.5" 5.56 NATO Upper Receiver - Sig Pink 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: $209.00MSRP: $299.00 -
On Sale
ALWAYS ARMED 7.5" 5.56 NATO UPPER RECEIVER - SIG PINK
Sale: $209.00MSRP: $299.00Always Armed 7.5" 5.56 NATO Upper Receiver - Sig Pink Made in the USA Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 7.5" 1:7 Twist 4150 Barrel with Black Nitride Finish Chambered in 5.56 NATO Pistol Length Gas System .750 Low...Sale: $209.00MSRP: $299.00 -
On Sale
ALWAYS ARMED 16" 300 BLACKOUT UPPER RECEIVER - SIG PINK
Sale: $219.00MSRP: $319.00Always Armed 16" 300 Blackout Upper Receiver - Sig Pink Made in the USA Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 16" 1:8 Twist 4150 Barrel with Black Nitride Finish Chambered in .300 Blackout Pistol Length Gas System .750...Sale: $219.00MSRP: $319.00 -
On Sale
ALWAYS ARMED 7.5" 9MM UPPER RECEIVER - SIG PINK
Sale: $219.00MSRP: $299.00Always Armed 7.5"9MM Upper Receiver - Sig Pink Made in the USA Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 7.5" 1:10 Twist 4150 Barrel with Black Nitride Finish Chambered in 9X19 Para A2 Flash Hider 7" Free Float M-LOK Hand...Sale: $219.00MSRP: $299.00 -
On Sale
ALWAYS ARMED 16" 7.62X39 UPPER RECEIVER - SIG PINK
Sale: $219.00MSRP: $319.00Always Armed 16" 7.62X39 Upper Receiver - Sig Pink 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 Low...Sale: $219.00MSRP: $319.00 -
On Sale
ALWAYS ARMED 7.5" 300 BLACKOUT UPPER RECEIVER - SIG PINK
Sale: $209.00MSRP: $299.00Always Armed 7.5" 300 Blackout Upper Receiver - Sig Pink Made in the USA 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 Pistol Length Gas System ...Sale: $209.00MSRP: $299.00 -
On Sale
ALWAYS ARMED 10.5" 7.62X39 UPPER RECEIVER - SIG PINK
Sale: $209.00MSRP: $299.00Always Armed 10.5" 7.62X39 Upper Receiver - Sig Pink 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: $209.00MSRP: $299.00 -
On Sale
ALWAYS ARMED 16" 9MM STAINLESS STEEL UPPER RECEIVER - SIG PINK
Sale: $269.00MSRP: $349.00ALWAYS ARMED 16" 9MM STAINLESS STEEL UPPER RECEIVER - SIG PINK Made in the USA Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 16" 1:10 Twist 416R Stainless Steel Barrel Chambered in 9X19 Para A2 Flash Hider 15" Free Float M-LOK...Sale: $269.00MSRP: $349.00 -
On Sale
ALWAYS ARMED 7.5" 9MM PISTOL KIT - SIG PINK
Sale: $359.00MSRP: $579.00Always Armed 7.5" 9mm Rifle Kit - Sig Pink Made in the USA Mil-Spec Lower Parts Kit 7.5" 1:10 Twist 4150 Barrel with Black Nitride Finish Chambered in 9X19 Para A2 Flash Hider 7" Free Float M-LOK Hand Guard Bolt Carrier Group Charging Handle ...Sale: $359.00MSRP: $579.00