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  • Suppressor Ready Builds
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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 Ormal 16-inch AR-15 .300 BLK Rifle Upper Build Kit
Davidson Defense Ormal 16-inch AR-15 .300 BLK Rifle Upper Build Kit
$189.99 $144.99
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
$159.99 $119.99
Davidson Defense Poker Ace w/SBA3 Brace 10.5-inch AR-15 .300 BLK Pistol Full Build Kit
Davidson Defense Poker Ace w/SBA3 Brace 10.5-inch AR-15 .300 BLK Pistol Full Build Kit
$419.99 $319.99
Davidson Defense Three Hundo 16-inch AR-15 .300 BLK Rifle Full Build Kit
Davidson Defense Three Hundo 16-inch AR-15 .300 BLK Rifle Full Build Kit
$334.99 $254.99
Davidson Defense Aegis Lightweight 10.5-inch Pistol-Gas 1:8 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Upper Build Kit
Davidson Defense Aegis Lightweight 10.5-inch Pistol-Gas 1:8 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Upper Build Kit
$174.99 $129.99
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
$189.99 $144.99
Davidson Defense Overrule 6-inch Pistol-Gas 1:7 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Complete Upper Build
Davidson Defense Overrule 6-inch Pistol-Gas 1:7 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Complete Upper Build
$259.99 $194.99
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
$169.99 $129.99
Davidson Defense Controlpoint 8.5-inch Pistol-Gas 1:9 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Full Build Kit, SBR Ready
Davidson Defense Controlpoint 8.5-inch Pistol-Gas 1:9 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Full Build Kit, SBR Ready
$299.99 $224.99
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
$189.99 $144.99
Davidson Defense Shadow Skirmisher w/SBA3 Brace 10.5-inch AR-15 .300 BLK Pistol Full Build Kit
Davidson Defense Shadow Skirmisher w/SBA3 Brace 10.5-inch AR-15 .300 BLK Pistol Full Build Kit
$414.99 $314.99
Davidson Defense Phantom's Fury 8.5-inch Pistol-Gas 1:8 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Upper Build Kit
Davidson Defense Phantom's Fury 8.5-inch Pistol-Gas 1:8 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Upper Build Kit
$179.99 $134.99
Davidson Defense Overrule 6-inch Pistol-Gas 1:7 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Upper Build Kit
Davidson Defense Overrule 6-inch Pistol-Gas 1:7 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Upper Build Kit
$179.99 $134.99
Davidson Defense Side Plan w/SBA3 Brace 10.5-inch AR-15 .300 BLK Pistol Full Build Kit
Davidson Defense Side Plan w/SBA3 Brace 10.5-inch AR-15 .300 BLK Pistol Full Build Kit
$434.99 $329.99
Davidson Defense Controlpoint w/SBA3 Brace 8.5-inch Pistol-Gas 1:9 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Full Build Kit
Davidson Defense Controlpoint w/SBA3 Brace 8.5-inch Pistol-Gas 1:9 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Full Build Kit
$398.99 $299.99
Davidson Defense Enterprise w/Magpul BTR Brace 7.5-inch Pistol-Gas 1:8 .300 BLK AR-15 Freefloat Quad-Rail Handguard Pistol Full Build Kit
Davidson Defense Enterprise w/Magpul BTR Brace 7.5-inch Pistol-Gas 1:8 .300 BLK AR-15 Freefloat Quad-Rail Handguard Pistol Full Build Kit
$374.99 $284.99

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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 [226]

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Davidson Defense
Davidson Defense "Hermits" AR-15 Pistol Upper Receiver 7.5" .300 Blackout 4150 CMV 1-8T Heavy Barrel 7" Smooth Tube Handguard (Assembled or Unassembled)
$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 $139.99 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
Davidson Defense "Idared" AR-15 Pistol Upper Receiver 10.5" .300 Blackout 4150 CMV 1-8T Heavy Barrel 10" M-Lok Handguard (Assembled or Unassembled)
$189.99 $144.99 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
$189.99 $144.99 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
$184.99 $139.99 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
$189.99 $144.99 Sale
In Stock
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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
$184.99 $139.99 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
$414.99 $314.99 Sale
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Davidson Defense 'Warpick w/KAK Brace' 7.5-inch AR-15 .300BLK Phosphate Pistol Full Build Kit
Davidson Defense 'Warpick w/KAK Brace' 7.5-inch AR-15 .300BLK Phosphate Pistol Full Build Kit
$354.99 $264.99 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
$329.99 $249.99 Sale
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Davidson Defense 'Warpick w/SBA5 Brace' 7.5-inch AR-15 .300BLK Phosphate Pistol Full Build Kit
Davidson Defense 'Warpick w/SBA5 Brace' 7.5-inch AR-15 .300BLK Phosphate Pistol Full Build Kit
$414.99 $314.99 Sale
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Davidson Defense 'Warpick w/SBM4 Brace' 7.5-inch AR-15 .300BLK Phosphate Pistol Full Build Kit
Davidson Defense 'Warpick w/SBM4 Brace' 7.5-inch AR-15 .300BLK Phosphate Pistol Full Build Kit
$364.99 $274.99 Sale
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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
$169.99 $124.99 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
$249.99 $189.99 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
$334.99 $254.99 Sale
In Stock
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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
$399.99 $299.99 Sale
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Davidson Defense 'Warpick' 7.5-inch AR-15 .300BLK Phosphate Pistol Complete Upper Build
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
$309.99 $234.99 Sale
In Stock
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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
$399.99 $299.99 Sale
In Stock
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