300BLK Build Kits

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.

  • Product
  • Qty in Cart
  • Quantity
  • Price
  • Subtotal
  • ALWAYS ARMED 10.5" 300 BLACKOUT RIFLE KIT - BLACK ANODIZED

    ALWAYS ARMED 10.5" 300 BLACKOUT PISTOL KIT - BLACK ANODIZED

    Now: $339.00
    Was: $449.99
    Always 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: $339.00
    Was: $449.99
    Qty in Cart: 0
    Quantity:
    Price:
    Now: $339.00
    Was: $449.99
    Subtotal:
  • ALWAYS ARMED 7.5" 300 BLACKOUT PISTOL KIT - BLACK ANODIZED

    ALWAYS ARMED 7.5" 300 BLACKOUT PISTOL KIT - BLACK ANODIZED

    Now: $339.00
    Was: $449.00
    Always 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 Blackout...
    Now: $339.00
    Was: $449.00
    Qty in Cart: 0
    Quantity:
    Price:
    Now: $339.00
    Was: $449.00
    Subtotal:
  • ALWAYS ARMED 16" 300 BLACKOUT RIFLE KIT - BLACK

    ALWAYS ARMED 16" 300 BLACKOUT RIFLE KIT - BLACK ANODIZED

    Now: $349.00
    Was: $469.00
    Always 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: $349.00
    Was: $469.00
    Qty in Cart: 0
    Quantity:
    Price:
    Now: $349.00
    Was: $469.00
    Subtotal:
  • ALWAYS ARMED 16" 300 BLACKOUT RIFLE KIT - TITANIUM

    ALWAYS ARMED 16" 300 BLACKOUT RIFLE KIT - TITANIUM

    Now: $379.00
    Was: $529.00
    Always 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: $379.00
    Was: $529.00
    Qty in Cart: 0
    Quantity:
    Price:
    Now: $379.00
    Was: $529.00
    Subtotal:
  • ALWAYS ARMED 7.5" 300 BLACKOUT PISTOL KIT - SMITH & WESSON RED

    ALWAYS ARMED 7.5" 300 BLACKOUT PISTOL KIT - SMITH & WESSON RED

    Now: $359.00
    Was: $499.00
    Always 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: $359.00
    Was: $499.00
    Qty in Cart: 0
    Quantity:
    Price:
    Now: $359.00
    Was: $499.00
    Subtotal:
  • ALWAYS ARMED 16" 300 RIFLE KIT - MAGPUL FDE

    ALWAYS ARMED 16" 300 BLACKOUT RIFLE KIT - MAGPUL FDE

    Now: $379.00
    Was: $529.00
    Always 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: $379.00
    Was: $529.00
    Qty in Cart: 0
    Quantity:
    Price:
    Now: $379.00
    Was: $529.00
    Subtotal:
  • ALWAYS ARMED 10.5" 300 BLACKOUT PISTOL KIT - TITANIUM

    ALWAYS ARMED 10.5" 300 BLACKOUT PISTOL KIT - TITANIUM

    Now: $359.00
    Was: $499.00
    Always 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: $359.00
    Was: $499.00
    Qty in Cart: 0
    Quantity:
    Price:
    Now: $359.00
    Was: $499.00
    Subtotal:
  • ALWAYS ARMED 16" 300 RIFLE KIT - BAZOOKA GREEN

    ALWAYS ARMED 16" 300 BLACKOUT RIFLE KIT - BAZOOKA GREEN

    Now: $379.00
    Was: $529.00
    Always 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: $379.00
    Was: $529.00
    Qty in Cart: 0
    Quantity:
    Price:
    Now: $379.00
    Was: $529.00
    Subtotal:
  • ALWAYS ARMED 10.5" 300 BLACKOUT PISTOL KIT - BURNT BRONZE

    ALWAYS ARMED 10.5" 300 BLACKOUT PISTOL KIT - BURNT BRONZE

    Now: $339.00
    Was: $499.00
    Always 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: $339.00
    Was: $499.00
    Qty in Cart: 0
    Quantity:
    Price:
    Now: $339.00
    Was: $499.00
    Subtotal:
  • ALWAYS ARMED 10.5" 300 BLACKOUT PISTOL KIT - MAGPUL FDE

    ALWAYS ARMED 10.5" 300 BLACKOUT PISTOL KIT - MAGPUL FDE

    Now: $359.00
    Was: $499.00
    Always 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: $359.00
    Was: $499.00
    Qty in Cart: 0
    Quantity:
    Price:
    Now: $359.00
    Was: $499.00
    Subtotal:
  • ALWAYS ARMED 16" 300 BLACKOUT RIFLE KIT - BURNT BRONZE

    ALWAYS ARMED 16" 300 BLACKOUT RIFLE KIT - BURNT BRONZE

    Now: $379.00
    Was: $529.00
    Always 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: $379.00
    Was: $529.00
    Qty in Cart: 0
    Quantity:
    Price:
    Now: $379.00
    Was: $529.00
    Subtotal:
  • ALWAYS ARMED 7.5" 300 BLACKOUT PISTOL KIT - MAGPUL FDE

    ALWAYS ARMED 7.5" 300 BLACKOUT PISTOL KIT - MAGPUL FDE

    Now: $339.00
    Was: $499.00
    Always 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: $339.00
    Was: $499.00
    Qty in Cart: 0
    Quantity:
    Price:
    Now: $339.00
    Was: $499.00
    Subtotal:
  • ALWAYS ARMED 7.5" 300 BLACKOUT PISTOL KIT - TITANIUM

    ALWAYS ARMED 7.5" 300 BLACKOUT PISTOL KIT - TITANIUM

    Now: $359.00
    Was: $499.00
    Always 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: $359.00
    Was: $499.00
    Qty in Cart: 0
    Quantity:
    Price:
    Now: $359.00
    Was: $499.00
    Subtotal:
  • ALWAYS ARMED 7.5" 300 BLACKOUT PISTOL KIT - BURNT BRONZE

    ALWAYS ARMED 7.5" 300 BLACKOUT PISTOL KIT - BURNT BRONZE

    Now: $359.00
    Was: $499.00
    Always 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: $359.00
    Was: $499.00
    Qty in Cart: 0
    Quantity:
    Price:
    Now: $359.00
    Was: $499.00
    Subtotal:
  • ALWAYS ARMED 7.5" 300 BLACKOUT PISTOL KIT - RIDGEWAY BLUE

    ALWAYS ARMED 7.5" 300 BLACKOUT PISTOL KIT - RIDGEWAY BLUE

    Now: $359.00
    Was: $499.00
    Always 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: $359.00
    Was: $499.00
    Qty in Cart: 0
    Quantity:
    Price:
    Now: $359.00
    Was: $499.00
    Subtotal:
  • ALWAYS ARMED 10.5" 300 BLACKOUT PISTOL KIT - SMITH & WESSON RED

    ALWAYS ARMED 10.5" 300 BLACKOUT PISTOL KIT - SMITH & WESSON RED

    Now: $359.00
    Was: $499.00
    Always 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: $359.00
    Was: $499.00
    Qty in Cart: 0
    Quantity:
    Price:
    Now: $359.00
    Was: $499.00
    Subtotal:
  • ALWAYS ARMED 10.5" 300 BLACKOUT PISTOL KIT - BAZOOKA GREEN

    ALWAYS ARMED 10.5" 300 BLACKOUT PISTOL KIT - BAZOOKA GREEN

    Now: $359.00
    Was: $499.00
    Always 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: $359.00
    Was: $499.00
    Qty in Cart: 0
    Quantity:
    Price:
    Now: $359.00
    Was: $499.00
    Subtotal:
  • ALWAYS ARMED 16" 300 BLACKOUT RIFLE KIT - SIG PINK

    ALWAYS ARMED 16" 300 BLACKOUT RIFLE KIT - SIG PINK

    Now: $379.00
    Was: $529.00
    Always 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: $379.00
    Was: $529.00
    Qty in Cart: 0
    Quantity:
    Price:
    Now: $379.00
    Was: $529.00
    Subtotal:
  • ALWAYS ARMED 16" 300 BLACKOUT RIFLE KIT - RIDGEWAY BLUE

    ALWAYS ARMED 16" 300 BLACKOUT RIFLE KIT - RIDGEWAY BLUE

    Now: $379.00
    Was: $529.00
    Always 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: $379.00
    Was: $529.00
    Qty in Cart: 0
    Quantity:
    Price:
    Now: $379.00
    Was: $529.00
    Subtotal:
  • ALWAYS ARMED 10.5" 300 BLACKOUT PISTOL KIT - RIDGEWAY BLUE

    ALWAYS ARMED 10.5" 300 BLACKOUT PISTOL KIT - RIDGEWAY BLUE

    Now: $359.00
    Was: $499.00
    Always 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: $359.00
    Was: $499.00
    Qty in Cart: 0
    Quantity:
    Price:
    Now: $359.00
    Was: $499.00
    Subtotal:
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