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" include the parts you need to build a high-quality, reliable rifle, including barrels, handguards, stocks, and more. These kits do not include a lower receiver.
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On Sale
ALWAYS ARMED 16" 5.56 NATO RIFLE KIT WITH BI-POD AND SIGHTS - BLACK ANODIZED
Sale: $349.00MSRP: $598.49ALWAYS ARMED 16" 5.56 NATO RIFLE KIT WITH BI-POD AND SIGHTS - 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: $598.49 -
On Sale
GHOST 16" 5.56 MID LENGTH RIFLE KIT - BLACK
Sale: $429.00MSRP: $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: $429.00MSRP: $499.00 -
On Sale
ALWAYS ARMED BX SERIES 16" 5.56 NATO RIFLE KIT - BLACK ANODIZED
Sale: $349.00MSRP: $469.00Always 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 System...Sale: $349.00MSRP: $469.00 -
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 Low...Sale: $349.00MSRP: $469.00 -
Out of stockOn 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 System .750...Sale: $409.00MSRP: $609.00 -
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 -
Grid Defense 16" 5.56 Rifle Kit with Magpul Accessories - Black
$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...$717.90 -
On 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 System ...Sale: $349.00MSRP: $469.00 -
GHOST FIREARMS 16" 5.56 WITH 14" M-LOK RAIL RIFLE KIT WITH MOE STOCK AND MOE+ GRIP- BLACK
$662.90GHOST FIREARMS 16" 5.56 RIFLE KIT 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...$662.90 -
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 -
On Sale
ALWAYS ARMED 16" 5.56 NATO TR RIFLE KIT - BLACK
Sale: $349.00MSRP: $469.00ALWAYS ARMED 16" 5.56 NATO TRX 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
ALWAYS ARMED 16" 5.56 NATO RIFLE KIT - BLACK
Sale: $349.00MSRP: $529.00Always 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" 1:7 Twist 4150 Barrel with Black Nitride Finish Chambered in 5.56 NATO Carbine Length Gas System ...Sale: $349.00MSRP: $529.00 -
On Sale
GHOST FIREARMS 16" 5.56 WITH 14" M-LOK RAIL RIFLE KIT - BLACK
Sale: $369.00MSRP: $499.00GHOST FIREARMS 16" 5.56 RIFLE KIT 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 Vital 16" 5.56 Rifle Kit
Sale: $429.00MSRP: $499.00Ghost Firearms Vital 16" Upper A2 Birdcage Flash Hider 16" 1:7 Twist 4150 M4 Barrel Black Nitride Carbine Length Gas System Ghost Firearms 11" M-Lok Free Float Hand Guard Ghost Mil-Spec 7075 T6 Upper...Sale: $429.00MSRP: $499.00