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 10.5" 300 BLACKOUT PISTOL KIT - BLACK ANODIZED
Now: $339.00Was: $449.99Always Armed 10.5" 300 Blackout Rifle Kit - Black Anodized 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...Now: $339.00Was: $449.99 -
ALWAYS ARMED 7.5" 300 BLACKOUT PISTOL KIT - BLACK
Now: $339.00Was: $449.00Always Armed 7.5" 300 Blackout Pistol Kit - Black Anodized 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...Now: $339.00Was: $449.00 -
ALWAYS ARMED 16" 300 BLACKOUT RIFLE KIT - BLACK ANODIZED
Now: $349.00Was: $469.00Always Armed 16" 300 Blackout Rifle Kit - Black Anodized Made in the USA Mil-Spec Lower Parts Kit Carbine Buffer Tube Assembly Rifle Butt Stock Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 16" 1:8 Twist 4150 Barrel with Black...Now: $349.00Was: $469.00 -
ALWAYS ARMED 16" 300 BLACKOUT RIFLE KIT - TITANIUM
Now: $379.00Was: $529.00Always Armed 16" 300 Blackout Rifle Kit - Titanium Made in the USA Mil-Spec Lower Parts Kit Carbine Buffer Tube Assembly Rifle Butt Stock Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 16" 1:8 Twist 4150 Barrel with Black...Now: $379.00Was: $529.00 -
ALWAYS ARMED 7.5" 300 BLACKOUT PISTOL KIT - SMITH & WESSON RED
Now: $359.00Was: $499.00Always Armed 7.5" 300 Blackout Pistol Kit - Smith & Wesson Red 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...Now: $359.00Was: $499.00 -
ALWAYS ARMED 16" 300 BLACKOUT RIFLE KIT - MAGPUL FDE
Now: $379.00Was: $529.00Always Armed 16" 300 Blackout Rifle Kit - FDE Made in the USA Rifle Butt Stock Carbine Buffer Tube Assembly Mil-Spec Lower Parts Kit Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 16" 1:8 Twist 4150 Barrel with Black Nitride...Now: $379.00Was: $529.00 -
ALWAYS ARMED 10.5" 300 BLACKOUT PISTOL KIT - TITANIUM
Now: $359.00Was: $499.00Always Armed 10.5" 300 Blackout Pistol Kit - Titanium 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 16" 300 BLACKOUT RIFLE KIT - BAZOOKA GREEN
Now: $379.00Was: $529.00Always Armed 16" 300 Blackout Rifle Kit - Bazooka Green 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 with Black...Now: $379.00Was: $529.00 -
ALWAYS ARMED 10.5" 300 BLACKOUT PISTOL KIT - BURNT BRONZE
Now: $339.00Was: $499.00Always Armed 10.5" 300 Blackout Rifle Kit - Burnt Bronze 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...Now: $339.00Was: $499.00 -
ALWAYS ARMED 10.5" 300 BLACKOUT PISTOL KIT - MAGPUL FDE
Now: $359.00Was: $499.00Always Armed 10.5" 300 Blackout Pistol Kit - Magpul FDE 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 16" 300 BLACKOUT RIFLE KIT - BURNT BRONZE
Now: $379.00Was: $529.00Always Armed 16" 300 Blackout Rifle Kit - Burnt Bronze Made in the USA Mil-Spec Lower Parts Kit Carbine Buffer Tube Assembly Rifle Butt Stock Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 16" 1:8 Twist 4150 Barrel with Black...Now: $379.00Was: $529.00 -
ALWAYS ARMED 7.5" 300 BLACKOUT PISTOL KIT - MAGPUL FDE
Now: $339.00Was: $499.00Always Armed 7.5" 300 Blackout Pistol Kit - Magpul FDE 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: $339.00Was: $499.00 -
ALWAYS ARMED 7.5" 300 BLACKOUT PISTOL KIT - TITANIUM
Now: $359.00Was: $499.00Always Armed 7.5" 300 Blackout Pistol Kit - Titanium 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 7.5" 300 BLACKOUT PISTOL KIT - BURNT BRONZE
Now: $359.00Was: $499.00Always Armed 7.5" 300 Blackout Pistol Kit - Burnt Bronze 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...Now: $359.00Was: $499.00 -
ALWAYS ARMED 7.5" 300 BLACKOUT PISTOL KIT - RIDGEWAY BLUE
Now: $359.00Was: $499.00Always Armed 7.5" 300 Blackout Pistol Kit - Ridgeway Blue 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 10.5" 300 BLACKOUT PISTOL KIT - SMITH & WESSON RED
Now: $359.00Was: $499.00Always Armed 10.5" 300 Blackout Pistol Kit - Smith & Wesson Red 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...Now: $359.00Was: $499.00 -
ALWAYS ARMED 10.5" 300 BLACKOUT PISTOL KIT - BAZOOKA GREEN
Now: $359.00Was: $499.00Always Armed 10.5" 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 10.5" 1:8 Twist 4150 Barrel with Black Nitride Finish Chambered in 300 Blackout...Now: $359.00Was: $499.00 -
ALWAYS ARMED 16" 300 BLACKOUT RIFLE KIT - SIG PINK
Now: $379.00Was: $529.00Always Armed 16" 300 Blackout Rifle Kit - Sig Pink 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 with Black...Now: $379.00Was: $529.00 -
ALWAYS ARMED 16" 300 BLACKOUT RIFLE KIT - RIDGEWAY BLUE
Now: $379.00Was: $529.00Always Armed 16" 300 Blackout Rifle Kit - Ridgeway Blue 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 with Black...Now: $379.00Was: $529.00 -
ALWAYS ARMED 10.5" 300 BLACKOUT PISTOL KIT - RIDGEWAY BLUE
Now: $359.00Was: $499.00Always Armed 10.5" 300 Blackout Pistol Kit - Ridgeway Blue 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