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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 '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
$344.99 $259.99
Davidson Defense Poker Ace w/Gauntlet Arms Brace 10.5-inch AR-15 .300 BLK Pistol Full Build Kit
Davidson Defense Poker Ace w/Gauntlet Arms Brace 10.5-inch AR-15 .300 BLK Pistol Full Build Kit
$364.99 $274.99
Davidson Defense 'Meteoric Ore' 7.5-inch AR-15 .300BLK Phosphate Pistol Upper Build Kit
Davidson Defense 'Meteoric Ore' 7.5-inch AR-15 .300BLK Phosphate Pistol Upper Build Kit
$174.99 $134.99
Davidson Defense Shadow Skirmisher w/Gauntlet Arms Brace 10.5-inch AR-15 .300 BLK Pistol Full Build Kit
Davidson Defense Shadow Skirmisher w/Gauntlet Arms Brace 10.5-inch AR-15 .300 BLK Pistol Full Build Kit
$359.99 $269.99
Davidson Defense 'Silent Lightning w/SBA3 Brace' 7.5-inch AR-15 .300BLK Phosphate Pistol Full Build Kit
Davidson Defense 'Silent Lightning w/SBA3 Brace' 7.5-inch AR-15 .300BLK Phosphate Pistol Full Build Kit
$454.99 $344.99
Davidson Defense Shadow Skirmisher 10.5-inch AR-15 .300 BLK Pistol Complete Upper
Davidson Defense Shadow Skirmisher 10.5-inch AR-15 .300 BLK Pistol Complete Upper
$284.99 $214.99
Davidson Defense Side Plan w/Gauntlet Arms Brace 10.5-inch AR-15 .300 BLK Pistol Full Build Kit
Davidson Defense Side Plan w/Gauntlet Arms Brace 10.5-inch AR-15 .300 BLK Pistol Full Build Kit
$384.99 $289.99
Davidson Defense Teleri (Suppressor Ready) 8.5-inch AR-15 .300 BLK Pistol Complete Upper
Davidson Defense Teleri (Suppressor Ready) 8.5-inch AR-15 .300 BLK Pistol Complete Upper
$259.99 $194.99
Davidson Defense 'Ionic Charge' 16-inch AR-15 .300BLK Phosphate Rifle Complete Upper Build
Davidson Defense 'Ionic Charge' 16-inch AR-15 .300BLK Phosphate Rifle Complete Upper Build
$334.99 $254.99
Davidson Defense Curse of Strahd w/SBM4 Brace 8.5-inch AR-15 .300 BLK Pistol Full Build Kit
Davidson Defense Curse of Strahd w/SBM4 Brace 8.5-inch AR-15 .300 BLK Pistol Full Build Kit
$444.99 $334.99

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  • AR-15 80% Upper Build Kits > .300 Blackout
  • AR-15 Full Build Kits (Everything Minus Lower) > .300 Blackout
  • AR-15 Complete Upper Build Kits > .300 Blackout
  • AR-15 Upper Build Kits > .300 Blackout

Products [105]

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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)
$399.99 $299.99 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
$194.99 $149.99 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
$199.99 $149.99 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
$219.99 $164.99 Sale
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Davidson Defense 'Pista' 7.5
Davidson Defense 'Pista' 7.5" AR-15 .300 Blackout Manganese Phosphate Pistol Upper Build Kit
$199.99 $149.99 Sale
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Davidson Defense 'Vapor' 7.5
Davidson Defense 'Vapor' 7.5" AR-15 .300 Blackout Manganese Phosphate Pistol Upper Build Kit
$189.99 $144.99 Sale
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Davidson Defense 'Mercs' 16
Davidson Defense 'Mercs' 16" AR-15 .300 Blackout Manganese Phosphate Upper Build Kit
$234.99 $179.99 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)
$439.99 $329.99 Sale
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Davidson Defense 'Annapolis' 10.5
Davidson Defense 'Annapolis' 10.5" AR-15 .300 Blackout Manganese Phosphate Pistol Upper Build Kit
$209.99 $159.99 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
$189.99 $144.99 Sale
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Davidson Defense 'Anthea' 7.5
Davidson Defense 'Anthea' 7.5" AR-15 .300 Blackout Manganese Phosphate Pistol Full Build Kit
$404.99 $304.99 Sale
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Davidson Defense 'Grimace' 7.5
Davidson Defense 'Grimace' 7.5" AR-15 .300 Blackout Manganese Phosphate Pistol Full Build Kit
$404.99 $304.99 Sale
In Stock
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Davidson Defense 'Pista' 7.5
Davidson Defense 'Pista' 7.5" AR-15 .300 Blackout Manganese Phosphate Pistol Full Build Kit
$409.99 $309.99 Sale
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Davidson Defense 'Vapor' 7.5
Davidson Defense 'Vapor' 7.5" AR-15 .300 Blackout Manganese Phosphate Pistol Full Build Kit
$394.99 $299.99 Sale
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Davidson Defense 'Flopzoom' 7.5
Davidson Defense 'Flopzoom' 7.5" AR-15 .300 Blackout Manganese Phosphate Pistol Full Build Kit
$384.99 $289.99 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
$254.99 $189.99 Sale
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Davidson Defense 'Ionic Charge' 16-inch AR-15 .300BLK Phosphate Rifle Upper Build Kit
Davidson Defense 'Ionic Charge' 16-inch AR-15 .300BLK Phosphate Rifle Upper Build Kit
$239.99 $179.99 Sale
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Davidson Defense 'Ionic Charge' 16-inch AR-15 .300BLK Phosphate Rifle Complete Upper Build
Davidson Defense 'Ionic Charge' 16-inch AR-15 .300BLK Phosphate Rifle Complete Upper Build
$334.99 $254.99 Sale
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Davidson Defense 'Ionic Charge' 16-inch AR-15 .300BLK Phosphate Rifle Full Build Kit
Davidson Defense 'Ionic Charge' 16-inch AR-15 .300BLK Phosphate Rifle Full Build Kit
$414.99 $314.99 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
$219.99 $164.99 Sale
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Davidson Defense 'Sky King' 16.5-inch AR-15 5.56 NATO Nitride Rifle Complete Upper Build
Davidson Defense 'Sky King' 16.5-inch AR-15 5.56 NATO Nitride Rifle Complete Upper Build
$714.99 $539.99 Sale
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Davidson Defense 'Golden Order-Side Charging' 8.5-inch AR-15 .300BLK Parkerized Side-Charging Pistol Upper Build Kit
Davidson Defense 'Golden Order-Side Charging' 8.5-inch AR-15 .300BLK Parkerized Side-Charging Pistol Upper Build Kit
$194.99 $149.99 Sale
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Davidson Defense 'Warpick' 7.5-inch AR-15 .300BLK Phosphate Pistol Upper Build Kit
Davidson Defense 'Warpick' 7.5-inch AR-15 .300BLK Phosphate Pistol Upper Build Kit
$194.99 $149.99 Sale
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Davidson Defense 'Warpick w/SBA3 Brace' 7.5-inch AR-15 .300BLK Phosphate Pistol Full Build Kit
Davidson Defense 'Warpick w/SBA3 Brace' 7.5-inch AR-15 .300BLK Phosphate Pistol Full Build Kit
$464.99 $349.99 Sale
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