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Search

.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 'Flopzoom' 7.5
Davidson Defense 'Flopzoom' 7.5" AR-15 .300 Blackout Manganese Phosphate Pistol Full Build Kit
$619.99 $334.99
Davidson Defense 'Morphinae' 7.5
Davidson Defense 'Morphinae' 7.5" AR-15 .300 Blackout Manganese Phosphate Pistol Upper Build Kit
$484.99 $199.99

Manufacturer

  1. Home
  2. AR-15 & AR-10 Build Kits
  3. Upper Builds by Caliber
  4. .300 Blackout AR-15 Upper Builds
  • 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 [90]

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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)
$574.99 $424.99 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
$559.99 $244.99 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
$559.99 $244.99 Sale
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MMC Arms Top Shelf
MMC Arms Top Shelf "Besra" AR-15 Pistol Featuring Davidson Defense Upper Receiver 10.5" Faxon Firearms .300 Blackout 4150 CMV 1-8T Barrel 7" M-Lok Davidson Defense Handguard (Assembled or Unassembled)
$579.99 $294.99 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
$569.99 $254.99 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
$554.99 $239.99 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
$554.99 $239.99 Sale
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Davidson Defense 'Mercs' 16
Davidson Defense 'Mercs' 16" AR-15 .300 Blackout Manganese Phosphate Upper Build Kit
$539.99 $224.99 Sale
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Davidson Defense
Davidson Defense "Dredd" AR-15 Upper Receiver 16" .300 Blackout 4150 CMV 1-8T Heavy Barrel 15" M-Lok Handguard (Assembled or Unassembled)
$509.99 $284.99 Sale
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Davidson Defense 'QST' 7.5
Davidson Defense 'QST' 7.5" AR-15 .300 Blackout Manganese Phosphate Pistol Upper Build Kit
$549.99 $234.99 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)
$509.99 $364.99 Sale
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Davidson Defense 'Frankfort' 10.5
Davidson Defense 'Frankfort' 10.5" AR-15 .300 Blackout Manganese Phosphate Pistol Upper Build Kit
$514.99 $199.99 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
$529.99 $214.99 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
$554.99 $239.99 Sale
In Stock
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Davidson Defense
Davidson Defense "Frutakia" AR-15 Pistol Upper Receiver 7.5" .300 Blackout 4150 CMV 1-8T Barrel 7" M-Lok Handguard (Assembled or Unassembled)
$584.99 $259.99 Sale
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Davidson Defense
Davidson Defense "Glypha" AR-15 Pistol Upper Receiver 10.5" .300 Blackout 4150 CMV 1-8T Heavy Barrel 12" M-Lok Handguard (Assembled or Unassembled)
$594.99 $274.99 Sale
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Davidson Defense 'Gorky' 10.5
Davidson Defense 'Gorky' 10.5" AR-15 .300 Blackout Manganese Phosphate Pistol Upper Build Kit
$549.99 $234.99 Sale
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Davidson Defense 'Heileen' 10.5 AR-15 .300 Blackout Manganese Phosphate Pistol Upper Build Kit
Davidson Defense 'Heileen' 10.5 AR-15 .300 Blackout Manganese Phosphate Pistol Upper Build Kit
$589.99 $274.99 Sale
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Davidson Defense
Davidson Defense "Zooka" AR-15 Pistol Upper Receiver 10.5" .300 Blackout 4150 CMV 1-8T Heavy Barrel 10" M-Lok Handguard (Assembled or Unassembled)
$594.99 $274.99 Sale
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Davidson Defense
Davidson Defense "Citronella" AR-15 Left Handed Pistol Upper Receiver 10.5" .300 Blackout 4150 CMV 1-8T Heavy Barrel 7" M-Lok Handguard (Assembled or Unassembled)
$569.99 $254.99 Sale
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Davidson Defense 'Imperata' 10.5
Davidson Defense 'Imperata' 10.5" AR-15 .300 Blackout Manganese Phosphate Pistol Upper Build Kit
$534.99 $219.99 Sale
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Davidson Defense 'Cogon' 10.5
Davidson Defense 'Cogon' 10.5" AR-15 .300 Blackout Manganese Phosphate Pistol Upper Build Kit
$554.99 $239.99 Sale
In Stock
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Davidson Defense
Davidson Defense "Pixiebob" AR-15 Pistol Upper Receiver 10" .300 Blackout 4150 CMV QPQ Nitride 1-7T Barrel 7" M-Lok Handguard (Assembled or Unassembled)
$609.99 $269.99 Sale
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Davidson Defense
Davidson Defense "Splice" AR-15 Upper Receiver 16" .300 Blackout 4150 CMV QPQ Nitride 1-8T Barrel 15" M-Lok Handguard (Assembled or Unassembled)
$649.99 $279.99 Sale
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