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.300 Blackout AR-15 Upper Builds


One of the most popular self defense and CQB calibers available on the market is the .300 Blackout, also commonly known as .300 AAC and .300 BLK. This round was developed with urban warfare in mind making it a great option for home defense but is also a blast to shoot at the range. Check out our MMC Armory conversion kits and complete uppers to make your build hassle free and at a great price.

Top Sellers

Davidson Defense Aegis 8.5-inch Pistol-Gas 1:8 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Upper Build Kit, Suppressor Ready
Davidson Defense Aegis 8.5-inch Pistol-Gas 1:8 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Upper Build Kit, Suppressor Ready
$174.99 $129.99
Davidson Defense Ormal 16-inch AR-15 .300 BLK Rifle Upper Build Kit
Davidson Defense Ormal 16-inch AR-15 .300 BLK Rifle Upper Build Kit
$199.99 $149.99
Davidson Defense Davidson Defense 'Warpick' 7.5-inch AR-15 .300BLK Phosphate Pistol Upper Build Kit
Davidson Defense Davidson Defense 'Warpick' 7.5-inch AR-15 .300BLK Phosphate Pistol Upper Build Kit
$184.99 $139.99
Davidson Defense Aegis w/Gauntlet Arms Brace 6-inch Pistol-Gas 1:7 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Full Build Kit
Davidson Defense Aegis w/Gauntlet Arms Brace 6-inch Pistol-Gas 1:7 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Full Build Kit
$339.99 $254.99
Davidson Defense Silent Guardian w/SBA5 Brace 7.5-inch Pistol-Gas 1:8 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Full Build Kit
Davidson Defense Silent Guardian w/SBA5 Brace 7.5-inch Pistol-Gas 1:8 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Full Build Kit
$409.99 $309.99
Davidson Defense Poker Ace 10.5-inch AR-15 .300 BLK Pistol Upper Build Kit
Davidson Defense Poker Ace 10.5-inch AR-15 .300 BLK Pistol Upper Build Kit
$199.99 $149.99
Davidson Defense Silent Guardian 7.5-inch Pistol-Gas 1:8 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Upper Build Kit
Davidson Defense Silent Guardian 7.5-inch Pistol-Gas 1:8 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Upper Build Kit
$179.99 $134.99
Davidson Defense Aegis w/Gauntlet Arms Brace 8.5-inch Pistol-Gas 1:8 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Full Build Kit, Suppressor Ready
Davidson Defense Aegis w/Gauntlet Arms Brace 8.5-inch Pistol-Gas 1:8 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Full Build Kit, Suppressor Ready
$318.99 $239.99
Davidson Defense Silent Guardian w/Gauntlet Arms Brace 7.5-inch Pistol-Gas 1:8 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Full Build Kit
Davidson Defense Silent Guardian w/Gauntlet Arms Brace 7.5-inch Pistol-Gas 1:8 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Full Build Kit
$324.99 $244.99
Davidson Defense Aegis 16-inch Pistol-Gas 1:8 .300 BLK AR-15 Freefloat M-Lok Handguard Rifle Full Build Kit
Davidson Defense Aegis 16-inch Pistol-Gas 1:8 .300 BLK AR-15 Freefloat M-Lok Handguard Rifle Full Build Kit
$339.99 $254.99
Davidson Defense 'Warpick w/Gauntlet Arms Brace' 7.5-inch AR-15 .300BLK Phosphate Pistol Full Build Kit
Davidson Defense 'Warpick w/Gauntlet Arms Brace' 7.5-inch AR-15 .300BLK Phosphate Pistol Full Build Kit
$338.99 $254.99
Davidson Defense Aegis Lightweight 16-inch Pistol-Gas 1:8 .300 BLK AR-15 Freefloat M-Lok Handguard Rifle Complete Upper Build
Davidson Defense Aegis Lightweight 16-inch Pistol-Gas 1:8 .300 BLK AR-15 Freefloat M-Lok Handguard Rifle Complete Upper Build
$278.99 $209.99
Davidson Defense Aegis 6-inch Pistol-Gas 1:7 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Upper Build Kit
Davidson Defense Aegis 6-inch Pistol-Gas 1:7 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Upper Build Kit
$189.99 $144.99
Blemished Reachback 8.5-inch Pistol-Gas 1:9 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Complete Upper Build
Blemished Reachback 8.5-inch Pistol-Gas 1:9 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Complete Upper Build
$264.99 $199.99
Davidson Defense Fleetbane w/Gauntlet Arms Brace 10.5-inch Pistol-Gas 1:8 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Full Build Kit
Davidson Defense Fleetbane w/Gauntlet Arms Brace 10.5-inch Pistol-Gas 1:8 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Full Build Kit
$334.99 $254.99
Davidson Defense Spartacus 16-inch Pistol-Gas 1:8 .300 BLK AR-15 M-Lok Handguard Rifle Full Build Kit
Davidson Defense Spartacus 16-inch Pistol-Gas 1:8 .300 BLK AR-15 M-Lok Handguard Rifle Full Build Kit
$351.99 $264.99

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  • AR-15 Upper Build Kits > .300 Blackout

Products [240]

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Davidson Defense Hermits AR-15 Pistol Upper Receiver 7.5
Davidson Defense Hermits AR-15 Pistol Upper Receiver 7.5" .300 Blackout 4150 CMV 1-8T Heavy Barrel 7" Smooth Tube Handguard
$159.99 $119.99 Sale
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Davidson Defense
Davidson Defense "Disaster" AR-15 Pistol Upper Receiver 8.5" .300 Blackout 4150 CMV QPQ Nitride 1-8T Barrel 7" M-Lok Handguard (Assembled or Unassembled)
$339.99 $254.99 Sale
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Davidson Defense 'Anthea' 7.5
Davidson Defense 'Anthea' 7.5" AR-15 .300 Blackout Manganese Phosphate Pistol Upper Build Kit
$184.99 $139.99 Sale
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Davidson Defense Grimace 7.5
Davidson Defense Grimace 7.5" AR-15 .300 Blackout Manganese Phosphate Pistol Upper Build Kit
$189.99 $144.99 Sale
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Davidson Defense 'Ivy' 7.5
Davidson Defense 'Ivy' 7.5" AR-15 .300 Blackout Manganese Phosphate Pistol Upper Build Kit
$204.99 $154.99 Sale
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Davidson Defense 'Mercs' 16
Davidson Defense 'Mercs' 16" AR-15 .300 Blackout Manganese Phosphate Upper Build Kit
$214.99 $164.99 Sale
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Davidson Defense
Davidson Defense "Boracite" Side Charging AR-15 Pistol Upper Receiver 8.5" .300 Blackout 4150 CMV 1-8T Barrel 9" M-Lok Handguard (Assembled or Unassembled)
$379.99 $284.99 Sale
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Davidson Defense 'Flopzoom' 7.5
Davidson Defense 'Flopzoom' 7.5" AR-15 .300 Blackout Manganese Phosphate Pistol Upper Build Kit
$179.99 $134.99 Sale
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Flopzoom .300Blackout Pistol Upper
Flopzoom .300Blackout Pistol Upper
$359.99 $274.99 Sale
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MMC 'Lightshow II - Grey .300 Blackout' 16-inch AR-15 .300BLK Nitride Rifle Upper Build Kit
MMC 'Lightshow II - Grey .300 Blackout' 16-inch AR-15 .300BLK Nitride Rifle Upper Build Kit
$204.99 $154.99 Sale
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Davidson Defense 'Bluetooth Hole Puncher' 8.5-inch AR-15 .300BLK Nitride Pistol Upper Build Kit
Davidson Defense 'Bluetooth Hole Puncher' 8.5-inch AR-15 .300BLK Nitride Pistol Upper Build Kit
$199.99 $149.99 Sale
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Davidson Defense Davidson Defense 'Warpick' 7.5-inch AR-15 .300BLK Phosphate Pistol Upper Build Kit
Davidson Defense Davidson Defense 'Warpick' 7.5-inch AR-15 .300BLK Phosphate Pistol Upper Build Kit
$184.99 $139.99 Sale
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Davidson Defense Davidson Defense 'Warpick w/SBA3 Brace' 7.5-inch AR-15 .300BLK Phosphate Pistol Full Build Kit
Davidson Defense Davidson Defense 'Warpick w/SBA3 Brace' 7.5-inch AR-15 .300BLK Phosphate Pistol Full Build Kit
$424.99 $319.99 Sale
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Davidson Defense Davidson Defense 'Warpick w/KAK Brace' 7.5-inch AR-15 .300BLK Phosphate Pistol Full Build Kit
Davidson Defense Davidson Defense 'Warpick w/KAK Brace' 7.5-inch AR-15 .300BLK Phosphate Pistol Full Build Kit
$364.99 $274.99 Sale
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Davidson Defense 'Warpick w/Gauntlet Arms Brace' 7.5-inch AR-15 .300BLK Phosphate Pistol Full Build Kit
Davidson Defense 'Warpick w/Gauntlet Arms Brace' 7.5-inch AR-15 .300BLK Phosphate Pistol Full Build Kit
$338.99 $254.99 Sale
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Davidson Defense Davidson Defense 'Warpick w/SBA5 Brace' 7.5-inch AR-15 .300BLK Phosphate Pistol Full Build Kit
Davidson Defense Davidson Defense 'Warpick w/SBA5 Brace' 7.5-inch AR-15 .300BLK Phosphate Pistol Full Build Kit
$424.99 $319.99 Sale
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Davidson Defense Davidson Defense 'Meteoric Ore' 7.5-inch AR-15 .300BLK Phosphate Pistol Upper Build Kit
Davidson Defense Davidson Defense 'Meteoric Ore' 7.5-inch AR-15 .300BLK Phosphate Pistol Upper Build Kit
$179.99 $134.99 Sale
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Davidson Defense 'Meteoric Ore' 7.5-inch AR-15 .300BLK Phosphate Pistol Complete Upper Build
Davidson Defense 'Meteoric Ore' 7.5-inch AR-15 .300BLK Phosphate Pistol Complete Upper Build
$264.99 $199.99 Sale
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Davidson Defense 'Meteoric Ore w/KAK Brace' 7.5-inch AR-15 .300BLK Phosphate Pistol Full Build Kit
Davidson Defense 'Meteoric Ore w/KAK Brace' 7.5-inch AR-15 .300BLK Phosphate Pistol Full Build Kit
$351.99 $264.99 Sale
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Davidson Defense 'Meteoric Ore w/SBA3 Brace' 7.5-inch AR-15 .300BLK Phosphate Pistol Full Build Kit
Davidson Defense 'Meteoric Ore w/SBA3 Brace' 7.5-inch AR-15 .300BLK Phosphate Pistol Full Build Kit
$411.99 $309.99 Sale
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Davidson Defense Davidson Defense 'Warpick' 7.5-inch AR-15 .300BLK Phosphate Pistol Complete Upper Build
Davidson Defense Davidson Defense 'Warpick' 7.5-inch AR-15 .300BLK Phosphate Pistol Complete Upper Build
$269.99 $199.99 Sale
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Davidson Defense 'Meteoric Ore w/Gauntlet Arms Brace' 7.5-inch AR-15 .300BLK Phosphate Pistol Full Build Kit
Davidson Defense 'Meteoric Ore w/Gauntlet Arms Brace' 7.5-inch AR-15 .300BLK Phosphate Pistol Full Build Kit
$325.99 $244.99 Sale
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Davidson Defense 'Meteoric Ore w/SBA5 Brace' 7.5-inch AR-15 .300BLK Phosphate Pistol Full Build Kit
Davidson Defense 'Meteoric Ore w/SBA5 Brace' 7.5-inch AR-15 .300BLK Phosphate Pistol Full Build Kit
$411.99 $309.99 Sale
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White Label Davidson Defense 'Esper Sentinel' 10.5-inch AR-15 .300BLK Phosphate Pistol Upper Build Kit
White Label Davidson Defense 'Esper Sentinel' 10.5-inch AR-15 .300BLK Phosphate Pistol Upper Build Kit
$189.99 $144.99 Sale
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