5.56mm Build Kits
At Grid Defense, we offer a wide selection of 5.56mm AR-15 build kits to help you create the perfect custom rifle. Our 7.5", 10.5" and 16" kits include everything you need to build a high-quality, reliable rifle, including barrels, handguards, stocks, and more.
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On Sale
Ghost Firearms 10.5" 5.56 NATO Pistol Kit - FDE
SALE: $439.00MSRP: $579.00Ghost Firearms 10.5" 5.56 NATO Pistol Kit - FDE Flat Dark Earth (FDE) Cerakote Finish Chambered in 5.56/.223 (5.56x45mm) M16 Bolt Carrier Group Mil-spec Charging Handle A2 Flash Hider 10.5" 1:7 Twist 4150 Chrome Moly Steel Barrel Black...SALE: $439.00MSRP: $579.00 -
On Sale
Ghost 16" 5.56 Mid Length with 11" Rail Rifle Kit - OD Green
SALE: $443.33MSRP: $599.00Ghost Firearms 16" 5.56 Mid Length Rifle Kit - OD Green Finished in Olive Drab Green Cerakote Chambered in 5.56/.223 (5.56x45mm) M16 Bolt Carrier Group Mil-spec Charging Handle A2 Flash Hider 16" 1:7 Twist 4150 Chrome Moly Steel Barrel...SALE: $443.33MSRP: $599.00 -
On Sale
GHOST 16" 5.56 MID LENGTH RIFLE KIT - BLACK
SALE: $369.00MSRP: $499.00GHOST 16" 5.56 MID LENGTH RIFLE KIT - BLACK 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...SALE: $369.00MSRP: $499.00 -
On Sale
Ghost 16" 5.56 Mid Length with 11" Rail Rifle Kit - FDE
SALE: $449.00MSRP: $599.00Ghost Firearms 16" 5.56 Mid Length Rifle Kit - FDE Flat Dark Earth (FDE) Cerakote Finish Chambered in 5.56/.223 (5.56x45mm) M16 Bolt Carrier Group Mil-spec Charging Handle A2 Flash Hider 16" 1:7 Twist 4150 Chrome Moly Steel Barrel...SALE: $449.00MSRP: $599.00 -
On Sale
ALWAYS ARMED BX SERIES 7.5" 5.56 NATO PISTOL KIT - BLACK ANODIZED
SALE: $339.00MSRP: $449.99ALWAYS ARMED BX SERIES 7.5" 5.56 NATO PISTOL KIT - BLACK ANODIZED 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...SALE: $339.00MSRP: $449.99 -
On Sale
ALWAYS ARMED BX SERIES 16" 5.56 NATO RIFLE KIT - BLACK ANODIZED
SALE: $349.00MSRP: $529.00Always Armed BX Series 16" 5.56 NATO 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 NATO Carbine Length Gas...SALE: $349.00MSRP: $529.00 -
On 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...SALE: $349.00MSRP: $469.00 -
On Sale
ALWAYS ARMED ULTRALIGHT 16" 5.56 NATO RIFLE KIT - BLACK ANODIZED
SALE: $409.00MSRP: $609.00Always Armed 16" 5.56 NATO Rifle Kit - Black Anodized Made in the USA Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 16" Pencil 1:7 Twist 4150 Barrel with Black Nitride Finish Chambered in 5.56 NATO Mid Length Gas...SALE: $409.00MSRP: $609.00 -
On Sale
ALWAYS ARMED 7.5" 5.56 NATO TR SERIES PISTOL KIT - BLACK ANODIZED
SALE: $339.00MSRP: $459.00Always Armed 7.5" 5.56 NATO TR Series Pistol Kit - Black Anodized 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...SALE: $339.00MSRP: $459.00 -
On Sale
ALWAYS ARMED 7.5" 5.56 NATO TR SERIES WITH TRINITY FORCE SIGHTS PISTOL KIT - FDE
SALE: $369.00MSRP: $489.98Always Armed 7.5" 5.56 NATO TR Series with Trinity Force Sights Pistol Kit - FDE 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...SALE: $369.00MSRP: $489.98 -
On Sale
ALWAYS ARMED 16" 5.56 NATO UPPER WITH 15" TR RAIL TRINITY FORCE SIGHTS RIFLE KIT - FDE
SALE: $389.00MSRP: $519.98Always Armed 16" 5.56 NATO Upper With 15" TR Rail Trinity Force Sights Rifle Kit - FDE 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: $389.00MSRP: $519.98 -
On Sale
ALWAYS ARMED 10.5" 5.56 NATO TRX SERIES WITH TRINITY FORCE SIGHTS PISTOL KIT - BLACK ANODIZED
SALE: $349.00MSRP: $489.00Always Armed 10.5" 5.56 NATO TRX Series with Trinity Force Sights 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...SALE: $349.00MSRP: $489.00 -
Out of stockOn Sale
ALWAYS ARMED JESTER 16" 5.56 NATO RIFLE KIT - BURNT BRONZE
SALE: $379.00MSRP: $529.00Always Armed Jester 16" 5.56 NATO Rifle Kit - Burnt Bronze 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...SALE: $379.00MSRP: $529.00 -
Out of stockOn Sale
ALWAYS ARMED JESTER 16" 5.56 NATO RIFLE KIT - FDE
SALE: $379.00MSRP: $529.00Always Armed Jester 16" 5.56 NATO Rifle Kit - FDE 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...SALE: $379.00MSRP: $529.00 -
Out of stockOn Sale
ALWAYS ARMED 16" 5.56 NATO TRX 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" 5.56 NATO TR SERIES WITH TRINITY FORCE SIGHTS PISTOL KIT - BLACK ANODIZED
SALE: $349.00MSRP: $489.00Always Armed 7.5" 5.56 NATO TR Series with Trinity Force Sights Pistol Kit - Black Anodized 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...SALE: $349.00MSRP: $489.00 -
On Sale
Grid Defense 16" 5.56 Rifle Kit with Magpul Accessories - Black
SALE: $599.00MSRP: $717.90Grid Defense 16" 5.56 Upper Receiver - Black Premium AR upper receiver, the new 5.56 AR upper from Grid Defense.With hard coat black anodized. Chambered in 5.56x45 NATO Skeletonized Upper Receivers 14" M-Lok Rail 16" 1:7 4150 M4 Barrel - Black...SALE: $599.00MSRP: $717.90 -
On Sale
Ghost 10.5" American Flag Engraved Upper 5.56 Pistol Kit - Black
SALE: $419.00MSRP: $494.00Ghost 10.5" American Flag Engraved Upper 5.56 Pistol Kit - Black Chambered in 5.56x45 NATO (5.56/.223) A2 Birdcage Flash Hider 10.5" 1:7 Twist 4150 M4 Barrel Black Nitride Carbine Length Gas System Ghost Firearms 9"...SALE: $419.00MSRP: $494.00 -
Out of stockOn Sale
ALWAYS ARMED JESTER 16" 5.56 NATO RIFLE KIT - BLACK
SALE: $349.00MSRP: $469.00Always Armed Jester 16" 5.56 NATO 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 NATO Carbine Length Gas...SALE: $349.00MSRP: $469.00 -
On Sale
ALWAYS ARMED Jester 10.5" 5.56 NATO JESTER FLASH CAN PISTOL KIT - BLACK
SALE: $359.00MSRP: $509.00Always Armed 10.5" 5.56 NATO Jester 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...SALE: $359.00MSRP: $509.00