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.

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  • ALWAYS ARMED 16" 300 BLACKOUT RIFLE KIT - SMITH & WESSON RED

    ALWAYS ARMED 16" 300 BLACKOUT RIFLE KIT - SMITH & WESSON RED

    Now: $379.00
    Was: $529.00
    Always 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: $379.00
    Was: $529.00
    Qty in Cart: 0
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    Now: $379.00
    Was: $529.00
    Subtotal:
  • ALWAYS ARMED 16" .300 BLACKOUT TR SERIES WITH TRINITY FORCE RIFLE KIT - BLACK

    ALWAYS ARMED 16" .300 BLACKOUT TR SERIES WITH TRINITY FORCE RIFLE KIT - BLACK

    Now: $359.00
    Was: $489.00
    ALWAYS 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: $359.00
    Was: $489.00
    Qty in Cart: 0
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    Now: $359.00
    Was: $489.00
    Subtotal:
  • ALWAYS ARMED 7.5" 300 BLACKOUT PISTOL KIT - BAZOOKA GREEN

    ALWAYS ARMED 7.5" 300 BLACKOUT PISTOL KIT - BAZOOKA GREEN

    Now: $359.00
    Was: $499.00
    Always 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: $359.00
    Was: $499.00
    Qty in Cart: 0
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    Now: $359.00
    Was: $499.00
    Subtotal:
  • ALWAYS ARMED 7.5" 300 BLACKOUT PISTOL KIT - SIG PINK

    ALWAYS ARMED 7.5" 300 BLACKOUT PISTOL KIT - SIG PINK

    Now: $359.00
    Was: $499.00
    Always 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: $359.00
    Was: $499.00
    Qty in Cart: 0
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    Now: $359.00
    Was: $499.00
    Subtotal:
  • ALWAYS ARMED 10.5" 300 BLACKOUT PISTOL KIT - SIG PINK

    ALWAYS ARMED 10.5" 300 BLACKOUT PISTOL KIT - SIG PINK

    Now: $359.00
    Was: $499.00
    Always 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: $359.00
    Was: $499.00
    Qty in Cart: 0
    Quantity:
    Price:
    Now: $359.00
    Was: $499.00
    Subtotal:
  • .300 Blackout AR15 Rifle Kit | Mil Spec | Hard Coat Black Anodized 16" 1:8 Twist | Black Nitride Barrel | 15" M-LOK Hand Guard

    ALWAYS ARMED OCTO SERIES 16" .300 BLACKOUT RIFLE KIT - BLACK

    Now: $349.00
    Was: $469.00
    ALWAYS 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: $349.00
    Was: $469.00
    Qty in Cart: 0
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    Now: $349.00
    Was: $469.00
    Subtotal:
  • ALWAYS ARMED 7.5" .300 BLACKOUT TR SERIES WITH TRINITY FORCE SIGHTS PISTOL KIT - FDE

    ALWAYS ARMED 7.5" .300 BLACKOUT TR SERIES WITH TRINITY FORCE SIGHTS PISTOL KIT - FDE

    Now: $369.00
    Was: $519.98
    Always 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: $369.00
    Was: $519.98
    Qty in Cart: 0
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    Now: $369.00
    Was: $519.98
    Subtotal:
  • ALWAYS ARMED 5" .300 BLACKOUT OCTO IHS PISTOL KIT ALWAYS ARMED 5" .300 Blackout PISTOL KIT

    ALWAYS ARMED 5" .300 BLACKOUT OCTO IHS PISTOL KIT

    $339.00 - $359.00
    Always 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
    Qty in Cart: 0
    Quantity:
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    $339.00 - $359.00
    Subtotal:
  • ALWAYS ARMED JESTER 16" .300 BLACKOUT RIFLE KIT - BURNT BRONZE

    ALWAYS ARMED JESTER 16" .300 BLACKOUT RIFLE KIT - BURNT BRONZE

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

    ALWAYS ARMED JESTER 16" .300 BLACKOUT RIFLE KIT - FDE

    Now: $379.00
    Was: $529.00
    Always 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: $379.00
    Was: $529.00
    Qty in Cart: 0
    Quantity:
    Price:
    Now: $379.00
    Was: $529.00
    Subtotal:
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