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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Out of stock
ALWAYS ARMED 10.5" STAINLESS STEEL .300 BLACKOUT UPPER RECEIVER - TITANIUM
Now: $209.00Was: $309.00ALWAYS ARMED 10.5" STAINLESS STEEL .300 BLACKOUT UPPER RECEIVER - TITANIUM Made in the USA Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 10.5" 1:8 Twist 416R Stainless Steel Barrel Chambered in .300 Blackout Pistol Length Gas...Now: $209.00Was: $309.00 -
ALWAYS ARMED 10.5" 300 BLACKOUT TR SERIES UPPER RECEIVER - BLACK
Now: $189.00Was: $289.00Always Armed 10.5" 300 Blackout TR Series Upper Receiver - Black 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 Finish Chambered in .300 Blackout Pistol...Now: $189.00Was: $289.00 -
ALWAYS ARMED 7.5" .300 BLACKOUT TR SERIES WITH TRINITY FORCE SIGHTS PISTOL KIT - FDE
Now: $359.00Was: $519.98Always 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: $359.00Was: $519.98 -
Out of stock
ALWAYS ARMED 16" 300 BLACKOUT RIFLE KIT - BLACK ANODIZED
Now: $359.00Was: $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: $359.00Was: $469.00 -
ALWAYS ARMED 10.5" .300 BLACKOUT BX SERIES UPPER RECEIVER - BLACK ANODIZED
Now: $189.00Was: $289.00ALWAYS ARMED 10.5" .300 BLACKOUT BX SERIES UPPER RECEIVER 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 Finish Chambered in .300 Blackout Pistol Length Gas System ...Now: $189.00Was: $289.00 -
ALWAYS ARMED 10.5" .300 BLACKOUT TR SERIES WITH TRINITY FORCE SIGHTS PISTOL KIT - BLACK ANODIZED
Now: $339.00Was: $489.00Always Armed 10.5" .300 Blackout TRX Series with Trinity Force Sights Pistol Kit - Black Anodized 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: $339.00Was: $489.00 -
Always Armed 10.5" .300 Blackout Upper Receiver - Tungsten Gray | POW MIA
$334.00Always Armed 10.5" .300 Blackout Upper Receiver Made in the USA Mil-Spec 7075 T6 Upper Receiver with POW MIA Dust Cover and Forward Assist 10.5" 1:8 Twist 4150 Barrel with Black Nitride Finish Chambered in .300 Blackout Pistol Length Gas...$334.00 -
Out of stock
Always Armed 10.5" .300 Blackout Upper Receiver with Stainless Steel Barrel and 7" M-Lok Hand Guard
$289.00Always Armed 10.5" .300 Blackout Upper Receiver with Stainless Steel Barrel and 7" M-Lok Hand Guard Hard Coat Black Anodized Finish Chambered in .300 Blackout (7.62x35) A2 Flash Hider 10.5" 1:8 Twist 416R Stainless Steel Light HBar Barrel ...$289.00 -
ALWAYS ARMED 10.5" 300 BLACKOUT PISTOL KIT - BLACK ANODIZED
Now: $339.00Was: $479.00Always 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 Blackout...Now: $339.00Was: $479.00 -
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 10.5" 300 BLACKOUT UPPER RECEIVER - BAZOOKA GREEN
Now: $209.00Was: $309.00Always Armed 10.5" 300 Blackout Upper Receiver - Bazooka Green 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 Finish Chambered in .300 Blackout Pistol Length Gas...Now: $209.00Was: $309.00 -
ALWAYS ARMED 10.5" 300 BLACKOUT UPPER RECEIVER - BURNT BRONZE
Now: $209.00Was: $309.00Always Armed 10.5" 300 Blackout Upper Receiver - Burnt Bronze 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 Finish Chambered in .300 Blackout Pistol Length Gas...Now: $209.00Was: $309.00 -
ALWAYS ARMED 10.5" 300 BLACKOUT UPPER RECEIVER - MAGPUL FDE
Now: $209.00Was: $309.00Always Armed 10.5" 300 Blackout Upper Receiver - Magpul FDE 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 Finish Chambered in .300 Blackout Pistol Length Gas...Now: $209.00Was: $309.00 -
ALWAYS ARMED 10.5" 300 BLACKOUT UPPER RECEIVER - RIDGEWAY BLUE
Now: $209.00Was: $309.00Always Armed 10.5" 300 Blackout Upper Receiver - Ridgeway Blue 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 Finish Chambered in .300 Blackout Pistol Length Gas...Now: $209.00Was: $309.00 -
ALWAYS ARMED 10.5" 300 BLACKOUT UPPER RECEIVER - SIG PINK
Now: $209.00Was: $309.00Always Armed 10.5" 300 Blackout Upper Receiver - Sig Pink 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 Finish Chambered in .300 Blackout Pistol Length Gas...Now: $209.00Was: $309.00 -
ALWAYS ARMED 10.5" 300 BLACKOUT UPPER RECEIVER - SMITH & WESSON RED
Now: $209.00Was: $309.00Always Armed 10.5" 300 Blackout Upper Receiver - Smith & Wesson Red 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 Finish Chambered in .300 Blackout Pistol...Now: $209.00Was: $309.00 -
ALWAYS ARMED 10.5" 300 BLACKOUT UPPER RECEIVER - TITANIUM
Now: $209.00Was: $309.00Always Armed 10.5" 300 Blackout Upper Receiver - Titanium 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 Finish Chambered in .300 Blackout Pistol Length Gas System ...Now: $209.00Was: $309.00 -
Out of stock
ALWAYS ARMED 10.5" 300 BLACKOUT UPPER RECEIVER WITH 9.25" RAIL, ADJUSTABLE GAS BLOCK AND ENHANCED SS MUZZLE DEVICE - BLACK ANODIZED
$309.99ALWAYS ARMED 10.5" 300 BLACKOUT UPPER RECEIVER WITH 9.25" RAIL, ADJUSTABLE GAS BLOCK AND ENHANCED SS MUZZLE DEVICE 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...$309.99 -
Out of stock
ALWAYS ARMED 10.5" 300 BLACKOUT UPPER RECEIVER WITH STAINLESS STEEL BARREL
Now: $189.00Was: $309.00ALWAYS ARMED 10.5" 300 BLACKOUT UPPER RECEIVER WITH STAINLESS STEEL BARREL Made in the USA Mil-Spec 7075 T6 Upper Receiver with Dust Cover and Forward Assist 10.5" 1:8 Twist 416R Stainless Steel Barrel Upper Receiver Chambered in .300...Now: $189.00Was: $309.00 -
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