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 16" .300 BLACKOUT TR SERIES WITH TRINITY FORCE RIFLE KIT - BLACK
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    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...
    Now: $359.00
    Was: $489.00
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    ALWAYS ARMED 7.5" .300 BLACKOUT TR SERIES WITH TRINITY FORCE SIGHTS PISTOL KIT - FDE
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    ALWAYS ARMED 7.5" .300 BLACKOUT TR SERIES WITH TRINITY FORCE SIGHTS PISTOL KIT - FDE

    Now: $359.00
    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...
    Now: $359.00
    Was: $519.98
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    Was: $519.98
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  • Out of stock
    Always Armed 10.5" .300 Blackout BR Series Pistol Kit components laid out neatly, featuring the black anodized upper receiver with a 9-inch BR M-LOK handguard, M16 bolt carrier group, lower parts kit, and pistol buffer tube assembly.
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    ALWAYS ARMED 10.5" .300 BLACKOUT BR SERIES PISTOL KIT

    Now: $319.00
    Was: $509.00
    Always Armed 10.5" .300 Blackout BR Series Pistol Kit  Made in the USA Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist  10.5" 1:8  Twist 4150 Barrel with Black Nitride...
    Now: $319.00
    Was: $509.00
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    Now: $319.00
    Was: $509.00
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  • Always Armed 10.5" .300 Blackout Gen 1 Pistol Kit components laid out neatly, featuring the black anodized upper receiver with a 10-inch Gen 1 M-LOK handguard, M16 bolt carrier group, lower parts kit, and pistol buffer tube assembly.
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    ALWAYS ARMED 10.5" .300 BLACKOUT GEN 1 PISTOL KIT

    $319.00 - $339.00
    Always Armed 10.5" .300 Blackout Gen 1 Pistol Kit  Made in the USA Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist  10.5" 1:8  Twist 4150 Barrel with Black Nitride...
    $319.00 - $339.00
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    Always Armed 10.5" .300 Blackout Octo Series Pistol Kit components laid out neatly, featuring the black anodized upper receiver with a 9.25-inch Octo M-LOK handguard, M16 bolt carrier group, lower parts kit, and pistol buffer tube assembly.
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    ALWAYS ARMED 10.5" .300 BLACKOUT OCTO SERIES PISTOL KIT

    $319.00 - $339.00
    Always Armed 10.5" .300 Blackout Octo Series Pistol Kit  Made in the USA Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist  10.5" 1:8  Twist 4150 Barrel with Black Nitride...
    $319.00 - $339.00
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  • Always Armed 10.5" .300 Blackout TR Series Pistol Kit components laid out neatly, featuring the black anodized upper receiver with a 10-inch M-LOK handguard, M16 bolt carrier group, lower parts kit, and pistol buffer tube assembly.
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    ALWAYS ARMED 10.5" .300 BLACKOUT TR SERIES PISTOL KIT

    $319.00 - $339.00
    Always Armed 10.5" .300 Blackout TR Series Pistol Kit  Made in the USA Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist  10.5" 1:8  Twist 4150 Barrel with Black Nitride...
    $319.00 - $339.00
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  • Always Armed 10.5 inch .300 Blackout TRX Series pistol build kit with Trinity Force sights and lower parts kit in black anodized finish
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    ALWAYS ARMED 10.5" .300 BLACKOUT TR SERIES WITH TRINITY FORCE SIGHTS PISTOL KIT - BLACK ANODIZED

    Now: $339.00
    Was: $489.00
    Build a complete, high-performance firearm setup with the Always Armed 10.5" .300 Blackout TRX Series Pistol Kit. Made in the USA, this comprehensive build kit includes everything needed to complete...
    Now: $339.00
    Was: $489.00
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    Was: $489.00
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  • Out of stock
    Always Armed 10.5 inch .300 Blackout upper receiver in Tungsten Gray Cerakote with POW MIA dust cover Engraved POW MIA ejection port dust cover and forward assist on 7075-T6 aluminum upper receiver
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    Always Armed 10.5" .300 Blackout Upper Receiver - Tungsten Gray | POW MIA

    $334.00
    Always Armed 10.5" .300 Blackout Upper Receiver - Tungsten Gray | POW MIA Engineered for reliable performance and custom style, the Always Armed 10.5" .300 Blackout Upper Receiver is an exceptional...
    $334.00
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    $334.00
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  • Out of stock
    Always Armed 10.5" .300 Blackout Upper Receiver with stainless steel barrel and black M-Lok hand guard
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    Always Armed 10.5" .300 Blackout Upper Receiver with Stainless Steel Barrel and 7" M-Lok Hand Guard

    $289.00
    Always Armed 10.5" .300 Blackout Upper Receiver - Stainless Steel Barrel & 7" M-Lok Hand Guard Deliver hard-hitting performance and pinpoint accuracy with the Always Armed 10.5" .300 Blackout Upper...
    $289.00
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    $289.00
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  • Out of stock
    Always Armed 10.5 inch 300 Blackout upper receiver with 9.25 inch M-LOK rail and stainless steel muzzle device
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    ALWAYS ARMED 10.5" 300 BLACKOUT UPPER RECEIVER WITH 9.25" RAIL, ADJUSTABLE GAS BLOCK AND ENHANCED SS MUZZLE DEVICE - BLACK ANODIZED

    $309.99
    Take control of your suppressed or unsuppressed AR-15 setup with the Always Armed 10.5" .300 Blackout Upper Receiver. Proudly Made in the USA, this precision-engineered upper receiver features an
    $309.99
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    $309.99
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  • Always Armed 16" .300 Blackout BR Series Rifle Kit components laid out neatly, featuring the black anodized upper receiver with a 15-inch BR M-LOK handguard, A2 flash hider, M16 bolt carrier group, lower parts kit, buffer tube kit, and M4 stock.
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    ALWAYS ARMED 16" .300 BLACKOUT BR SERIES RIFLE KIT

    $319.00 - $339.00
    Always Armed 16" .300 Blackout BR Series 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...
    $319.00 - $339.00
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  • Always Armed 16" .300 Blackout GEN 1 Rifle Kit components laid out neatly, featuring the black anodized upper receiver with a 14-inch Gen 1 M-LOK handguard, heavy profile barrel, M16 bolt carrier group, lower parts kit, buffer tube kit, and M4 stock.
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    ALWAYS ARMED 16" .300 BLACKOUT GEN 1 RIFLE KIT

    $319.00 - $339.00
    Always Armed 16" .300 Blackout GEN 1 Rifle Kit Upper Specifications Mil-Spec Upper Receiver Machined from 7075-T6 Forging Mil-Spec dust cover and forward assist Made in the USA 14" Free Float Gen 1...
    $319.00 - $339.00
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  • Flat lay view of the Always Armed 16-inch .300 Blackout Octo Series rifle kit showing all upper, lower parts, stock, and BCG components.
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    ALWAYS ARMED 16" .300 BLACKOUT OCTO SERIES RIFLE KIT

    $319.00 - $339.00
    Always Armed 16" .300 Blackout Octo Series 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...
    $319.00 - $339.00
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  • Always Armed 16" .300 Blackout TR Series Rifle Kit components laid out neatly, featuring the black anodized upper receiver with a 15-inch TR M-LOK handguard, A2 flash hider, M16 bolt carrier group, lower parts kit, buffer tube kit, and M4 stock.
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    ALWAYS ARMED 16" .300 BLACKOUT TR SERIES RIFLE KIT

    $319.00 - $339.00
    Always Armed 16" .300 Blackout TR Series 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...
    $319.00 - $339.00
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    $319.00 - $339.00
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  • Always Armed 7.5-inch .300 Blackout BR Series Pistol Kit components laid out, featuring the upper receiver with a 7-inch M-LOK handguard, Black Nitride barrel, BCG, and lower parts kit.
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    ALWAYS ARMED 7.5" .300 BLACKOUT BR SERIES PISTOL KIT

    Now: $319.00
    Was: $509.00
    Always Armed 7.5" .300 Blackout BR Series Pistol Kit 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...
    Now: $319.00
    Was: $509.00
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    Now: $319.00
    Was: $509.00
    Subtotal:
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  • Always Armed 7.5-inch .300 Blackout Gen 1 Pistol Kit components laid out, featuring the upper receiver with a 7-inch M-LOK handguard, Black Nitride barrel, BCG, and lower parts kit.
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    ALWAYS ARMED 7.5" .300 BLACKOUT GEN 1 PISTOL KIT

    $319.00 - $339.00
    Always Armed 7.5" .300 Blackout Gen 1 Pistol Kit 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...
    $319.00 - $339.00
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    $319.00 - $339.00
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  • Always Armed 7.5-inch .300 Blackout Octo Series Pistol Kit components laid out, featuring the upper receiver with a 7.25-inch M-LOK handguard, Black Nitride barrel, BCG, and lower parts kit.
    Choose Options
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    ALWAYS ARMED 7.5" .300 BLACKOUT OCTO SERIES PISTOL KIT

    $319.00 - $339.00
    Always Armed 7.5" .300 Blackout Octo Series Pistol Kit 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...
    $319.00 - $339.00
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    $319.00 - $339.00
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