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
7.5" 5.56mm with 7" M-Lok Pistol Kit Blue Titanium
Sale: $439.00MSRP: $579.00Ghost Firearms 7.5" 5.56 Pistol Kit - Blue Titanium Blue Titanium Cerakote Finished Chambered in 5.56/.223 (5.56x45mm) M16 Bolt Carrier Group Mil-spec Charging HandlSale: $439.00MSRP: $579.00 -
On Sale
Ghost Firearms 7.5" 5.56mm with 7" M-Lok Pistol Kit OD Green
Sale: $439.00MSRP: $579.00Ghost Firearms 7.5" Pistol Kit - OD Green OD Green Cerakote Finished Chambered in 5.56/.223 (5.56x45mm) M16 Bolt Carrier Group Mil-Spec Charging HandleSale: $439.00MSRP: $579.00 -
Out of stock
$499.00 -
On Sale
Ghost 10.5" 5.56 Pistol Kit - Burnt Bronze
Sale: $439.00MSRP: $579.00Ghost 10.5" 5.56 Pistol Kit - Burnt Bronze Burnt Bronze Cerakote Finish Chambered in 5.56/.223 (5.56x45mm) M16 Bolt Carrier Group Mil-spec Charging Handle A2 Flash HideSale: $439.00MSRP: $579.00 -
On Sale
10.5" 5.56mm with 9" M-Lok Pistol Kit Blue Titanium
Sale: $439.00MSRP: $579.00Ghost Firearms 10.5" 5.56 Pistol Kit - Blue Titanium Premium AR-15 pistol build kits, the M-Lok pistol kit with A2 flash can. Finished in blue titanium cerakote. Chambered in 5.56/.223 (5.56x45mm)...Sale: $439.00MSRP: $579.00 -
Out of stock
Ghost Vital 16" 5.56 Rifle Build Kit With Nickel Boron Lower Parts kit
$529.00Ghost Firearms Vital 16" Upper - Black Chambered in 5.56x45 NATO (5.56/.223) A2 Birdcage Flash Hider 16" 1:7 or 1:8 Twist 4150 M4 Barrel Black Nitride Carbine Length Gas System Ghost...$529.00 -
On Sale
Ghost Firearms 16" 5.56mm with 14" M-Lok Rifle Kit - Burnt Bronze
Sale: $399.00MSRP: $599.00Ghost Firearms 16" 5.56 Rifle Kit - Burnt Bronze Burnt Bronze Cerakote Finish Chambered in 5.56/.223 (5.56x45mm) M16 Bolt Carrier Group Mil-spec Charging HandleSale: $399.00MSRP: $599.00 -
On Sale
7.5" 5.56mm with 7" M-Lok Pistol Kit - Tungsten Gray
Sale: $439.00MSRP: $579.00Ghost Firearms 7.5" Pistol Kit - Tungsten Gray Chambered in 5.56/.223 (5.56x45mm) M16 Bolt Carrier Group Mil-spec Charging Handle A2 Flash HiderSale: $439.00MSRP: $579.00 -
On Sale
10.5" 5.56mm with 9" M-Lok Pistol Kit OD Green
Sale: $439.00MSRP: $579.00Ghost Firearms 10.5" 5.56 Pistol Kit - OD Green OD Green Cerakote Finish Chambered in 5.56/.223 (5.56x45mm) M16 Bolt Carrier Group Mil-spec Charging Handle A2 FlasSale: $439.00MSRP: $579.00 -
On Sale
Ghost Firearms 7.5" 5.56mm with 7" M-Lok Pistol Kit - Burnt Bronze
Sale: $379.00MSRP: $579.00Ghost Firearms 7.5" 5.56 Pistol Kit - Burnt Bronze Burnt Bronze Cerakote Finished Chambered in 5.56/.223 (5.56x45mm) M16 Bolt Carrier Group MiSale: $379.00MSRP: $579.00 -
On Sale
Ghost Firearms 16" 5.56mm with 14" M-Lok Rifle Kit - OD Green
Sale: $449.00MSRP: $599.00Ghost Firearms 16" Rifle Kit - OD Green OD Green Cerakote Finish Chambered in 5.56/.223 (5.56x45mm) M16 Bolt Carrier Group Mil-spec Charging Handle A2 FlaSale: $449.00MSRP: $599.00