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
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 HandleSale: $439.00MSRP: $579.00 -
Out of stockOn Sale
ALWAYS ARMED 10.5" 5.56 NATO OCTO SERIES PISTOL KIT
$319.00 - $339.00Always Armed 10.5" 5.56 NATO Octo Series Pistol Kit 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...$319.00 - $339.00 -
ALWAYS ARMED 7.5" 5.56 NATO OCTO SERIES PISTOL KIT
$319.00 - $339.00Always Armed 7.5" 5.56 NATO Octo Series Pistol Kit 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...$319.00 - $339.00 -
On Sale
ALWAYS ARMED 7.5" 5.56 NATO BR SERIES PISTOL KIT
Sale: $319.00MSRP: $509.00Always Armed 7.5" 5.56 NATO BR Series Pistol Kit 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...Sale: $319.00MSRP: $509.00 -
On Sale
ALWAYS ARMED 7.5" 5.56 NATO TR SERIES PISTOL KIT
$319.00 - $339.00Always Armed 7.5" 5.56 NATO TR Series Pistol Kit 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...$319.00 - $339.00 -
Out of stockOn Sale
ALWAYS ARMED 10.5" 5.56 NATO BR SERIES PISTOL KIT
Sale: $319.00MSRP: $509.00Always Armed 10.5" 5.56 NATO BR Series Pistol Kit 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: $319.00MSRP: $509.00 -
On Sale
ALWAYS ARMED 10.5" 5.56 NATO GEN 1 PISTOL KIT
$319.00 - $339.00Always Armed 10.5" 5.56 NATO Gen 1 Pistol Kit 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...$319.00 - $339.00 -
On Sale
ALWAYS ARMED 16" 5.56 NATO GEN 1 RIFLE KIT
$329.00 - $349.00Always Armed 16" 5.56 NATO Gen 1 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...$329.00 - $349.00 -
On Sale
ALWAYS ARMED 16" 5.56 NATO TR SERIES RIFLE KIT
$329.00 - $349.00Always Armed 16" 5.56 NATO TR Series 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...$329.00 - $349.00 -
On Sale
ALWAYS ARMED 7.5" 5.56 NATO GEN 1 PISTOL KIT
$319.00 - $339.00Always Armed 7.5" 5.56 NATO Gen 1 Pistol Kit 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...$319.00 - $339.00 -
On Sale
ALWAYS ARMED 16" 5.56 NATO QUAD RAIL RIFLE KIT
$349.00 - $369.00Always Armed 16" 5.56 NATO Quad Rail Rifle Kit Made in the USA 16" 4150 Black Nitride Barrel 1:7 Twist Rate Chambered in 5.56 NATO 15" Quad Rail Free Floating MLOK Quad Rail Hard Coat Black Anodized...$349.00 - $369.00 -
On Sale
ALWAYS ARMED 16" 5.56 NATO PENCIL BARREL GEN 1 RIFLE KIT
$329.00 - $349.00Always Armed 16" 5.56 NATO Pencil Barrel Gen 1 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...$329.00 - $349.00 -
On Sale
ALWAYS ARMED 16" 5.56 NATO MID LENGTH GEN 1 RIFLE KIT
$329.00 - $349.00Always Armed 16" 5.56 NATO Mid Length Gen 1 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...$329.00 - $349.00 -
On Sale
ALWAYS ARMED 16" 5.56 NATO BR SERIES RIFLE KIT
$329.00 - $349.00Always Armed 16" 5.56 NATO BR Series 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...$329.00 - $349.00 -
Out of stock
Ghost 18" 5.56 NATO Rifle Length Rifle Kit
$429.00 - $449.00Ghost 18" 5.56 NATO Rifle Length Rifle Kit Made in the USA Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 18" 1:7 Twist 4150 Barrel with Black Nitride Finish Chambered in 5...$429.00 - $449.00 -
Ghost IHS 5" 5.56 Pistol Kit
$419.00 - $439.00Ghost IHS 5" 5.56 Pistol Kit Chambered in 5.56x45 NATO (5.56/.223) A2 Birdcage Flash Hider 5" 1:5 Twist 4150 M4 Barrel Black Nitride Micro Length Gas System Ghost Firearms 4.25" IHS...$419.00 - $439.00 -
On Sale
16" 5.56mm with 14" M-Lok Rifle Kit - Zombie Green
Sale: $449.00MSRP: $599.00Ghost Firearms 16" 5.56 Rifle Kit - Zombie Green Zombie Green Cerakote Finish Chambered in 5.56/.223 (5.56x45mm) M16 Bolt Carrier Group Mil-spec Charging HandleSale: $449.00MSRP: $599.00 -
Out of stockOn Sale
ALWAYS ARMED 16" 5.56 NATO RIFLE KIT WITH BI-POD AND SIGHTS
Sale: $369.00MSRP: $598.49ALWAYS ARMED 16" 5.56 NATO RIFLE KIT WITH BI-POD AND SIGHTS Mil-Spec 7075-T6 Forged Upper Receiver Made in The USA 16" 1:7 Twist 4150 Barrel with Black Nitride Finish Chambered in 5.56 NATO Carbine...Sale: $369.00MSRP: $598.49 -
Out of stockOn Sale
Ghost Vital 7.5" 5.56 Stainless Steel Pistol Kit
Sale: $419.00MSRP: $479.00Ghost Firearms Vital 7.5" 5.56 Upper Stainless Steel - Black Chambered in 5.56x45 NATO (5.56/.223) A2 Birdcage Flash Hider - Black 7.5" 1:7 Twist 416R Stainless Steel Barrel Pistol Length Gas...Sale: $419.00MSRP: $479.00 -
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 HandleSale: $443.33MSRP: $599.00