300 Blackout Build Kits

300 Blackout 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 7.5" 300 BLACKOUT PISTOL KIT - BLACK ANODIZED
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    ALWAYS ARMED 7.5" 300 BLACKOUT PISTOL KIT - BLACK ANODIZED

    Now: $339.00
    Was: $459.00
    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...
    Now: $339.00
    Was: $459.00
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    Now: $339.00
    Was: $459.00
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  • Always Armed 7.5 inch 300 Blackout AR pistol kit in Magpul FDE Cerakote with 7 inch M-LOK rail, bolt carrier group, and pistol buffer tube assembly
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    ALWAYS ARMED 7.5" 300 BLACKOUT PISTOL KIT - MAGPUL FDE

    Now: $359.00
    Was: $499.00
    Build a compact, hard-hitting firearm with the Always Armed 7.5" 300 Blackout Pistol Kit. Precision-engineered and 100% Made in the USA, this all-in-one assembly package provides every high-quality...
    Now: $359.00
    Was: $499.00
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    Now: $359.00
    Was: $499.00
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  • ALWAYS ARMED JESTER 16" .300 BLACKOUT RIFLE KIT - BURNT BRONZE
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    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...
    Now: $379.00
    Was: $529.00
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    Now: $379.00
    Was: $529.00
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  • ALWAYS ARMED JESTER 16" .300 BLACKOUT RIFLE KIT - FDE
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    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...
    Now: $379.00
    Was: $529.00
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    Now: $379.00
    Was: $529.00
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  • Out of stock
    ALWAYS ARMED OCTO SERIES 10.5" .300 BLACKOUT UPPER RECEIVER - BURNT BRONZE ALWAYS ARMED OCTO SERIES 10.5" .300 BLACKOUT UPPER RECEIVER - BURNT BRONZE
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    ALWAYS ARMED OCTO SERIES 10.5" .300 BLACKOUT UPPER RECEIVER - BURNT BRONZE

    Now: $209.00
    Was: $309.00
    ALWAYS ARMED OCTO SERIES 10.5" .300 BLACKOUT UPPER RECEIVER - BURNT BRONZE Made in the USA Burnt Bronze Cerakote Finish Mil-Spec AR15 7075 T6 .300 Upper Receiver with Dust Cover and Forward Assist 9...
    Now: $209.00
    Was: $309.00
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    Now: $209.00
    Was: $309.00
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  • Out of stock
    ALWAYS ARMED OCTO SERIES 10.5" .300 BLACKOUT UPPER RECEIVER - FDE ALWAYS ARMED OCTO SERIES 10.5" .300 BLACKOUT UPPER RECEIVER - FDE
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    ALWAYS ARMED OCTO SERIES 10.5" .300 BLACKOUT UPPER RECEIVER - FDE

    Now: $209.00
    Was: $309.00
    ALWAYS ARMED OCTO SERIES 10.5" .300 BLACKOUT UPPER RECEIVER - FDE Made in the USA Magpul FDE Cerakote Finish Mil-Spec AR15 7075 T6 Upper Receiver with Dust Cover and Forward Assist 9.25" Free Float...
    Now: $209.00
    Was: $309.00
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    Now: $209.00
    Was: $309.00
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    Out of stock
  • ALWAYS ARMED OCTO SERIES 16" .300 BLACKOUT RIFLE KIT - BLACK ALWAYS ARMED OCTO SERIES 16" .300 BLACKOUT RIFLE KIT - BLACK
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    ALWAYS ARMED OCTO SERIES 16" .300 BLACKOUT RIFLE KIT - BLACK

    Now: $379.00
    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...
    Now: $379.00
    Was: $469.00
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    Now: $379.00
    Was: $469.00
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  • Out of stock
    Always Armed TR Series 10.5" .300 Blackout Upper Receiver - Black Always Armed TR Series 10.5" .300 Blackout Upper Receiver - Black
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    Always Armed TR Series 10.5" .300 Blackout Upper Receiver - Black

    Now: $189.00
    Was: $289.00
    10.5" .300 Blackout Upper Receiver with 10" M-LOK Hand Guard  Made in the USA 10.5" 4150 Barrel Chambered in .300 Blackout 1:8 Twist 10" Free Floating Mlok Hand Guard Black Anodized Finish Pistol...
    Now: $189.00
    Was: $289.00
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    Qty in Cart: 0
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    Now: $189.00
    Was: $289.00
    Subtotal:
    Out of stock
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