300BLK Build Kits
Build your own AR-15 with our complete 300 Blackout build kits, perfect for rifle and pistol configurations. Each kit includes high-quality components—uppers, lowers, and parts—designed for accuracy and reliability. Great for suppressed or subsonic setups, our 300BLK kits are easy to assemble and available in custom Cerakote finishes to match your style and shooting needs.
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ALWAYS ARMED 16" 300 BLACKOUT RIFLE KIT - SMITH & WESSON RED
Now: $379.00Was: $529.00Always Armed 16" 300 Blackout Rifle Kit - Smith & Wesson Red Made in the USA Mil-Spec Lower Parts Kit Rifle Butt Stock Carbine Buffer Tube Assembly Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 16" 1:8 Twist 4150 Barrel...Now: $379.00Was: $529.00 -
ALWAYS ARMED 16" .300 BLACKOUT TR SERIES WITH TRINITY FORCE RIFLE KIT - BLACK
Now: $359.00Was: $489.00ALWAYS ARMED 16" .300 BLACKOUT TR SERIES RIFLE KIT - BLACK 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...Now: $359.00Was: $489.00 -
ALWAYS ARMED 7.5" 300 BLACKOUT PISTOL KIT - BAZOOKA GREEN
Now: $359.00Was: $499.00Always Armed 7.5" 300 Blackout Pistol Kit - Bazooka Green Made in the USA Mil-Spec Lower Parts Kit 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...Now: $359.00Was: $499.00 -
ALWAYS ARMED 7.5" 300 BLACKOUT PISTOL KIT - SIG PINK
Now: $359.00Was: $499.00Always Armed 7.5" 300 Blackout Pistol Kit - Sig Pink Made in the USA Mil-Spec Lower Parts Kit 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...Now: $359.00Was: $499.00 -
ALWAYS ARMED 10.5" 300 BLACKOUT PISTOL KIT - SIG PINK
Now: $359.00Was: $499.00Always Armed 10.5" 300 Blackout Pistol Kit - Sig Pink Made in the USA Mil-Spec Lower Parts Kit Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 10.5" 1:8 Twist 4150 Barrel with Black Nitride Finish Chambered in 300 Blackout...Now: $359.00Was: $499.00 -
ALWAYS ARMED OCTO SERIES 16" .300 BLACKOUT RIFLE KIT - BLACK
Now: $349.00Was: $469.00ALWAYS ARMED OCTO SERIES 16" .300 BLACKOUT RIFLE KIT 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...Now: $349.00Was: $469.00 -
ALWAYS ARMED 7.5" .300 BLACKOUT TR SERIES WITH TRINITY FORCE SIGHTS PISTOL KIT - FDE
Now: $369.00Was: $519.98Always Armed 7.5" .300 Blackout 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" 1:8 Twist 4150 Barrel with Black Nitride Finish Chambered in .300...Now: $369.00Was: $519.98 -
ALWAYS ARMED 5" .300 BLACKOUT OCTO IHS PISTOL KIT
$339.00 - $359.00Always Armed 5" .300 Blackout Pistol Kit Made in the USA Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 7.5" 1:5 Twist 4150 Barrel with Black Nitride Finish Chambered in .300 Blackout Micro Length Gas System .750 Low...$339.00 - $359.00 -
ALWAYS ARMED JESTER 16" .300 BLACKOUT RIFLE KIT - BURNT BRONZE
Now: $379.00Was: $529.00Always Armed Jester 16" .300 Blackout Rifle Kit - Burnt Bronze 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...Now: $379.00Was: $529.00 -
ALWAYS ARMED JESTER 16" .300 BLACKOUT RIFLE KIT - FDE
Now: $379.00Was: $529.00Always Armed Jester 16" .300 Blackout Rifle Kit - FDE 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...Now: $379.00Was: $529.00