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Upper Builds by Caliber

Top Sellers

Davidson Defense 'Reasonable' 16
Davidson Defense 'Reasonable' 16" AR-15 5.56 NATO Nitride Rifle Upper Build Kit
$479.99 $194.99
MMC 'Sperwer' 20
MMC 'Sperwer' 20" LR-308 .308 Win Nitride Rifle Full Build Kit
$909.99 $599.99
Davidson Defense 'Fire Starter' 18
Davidson Defense 'Fire Starter' 18" LR-308 .308 Win Nitride Rifle Full Build Kit
$714.99 $499.99
Davidson Defense 'Twardy' 20
Davidson Defense 'Twardy' 20" LR-308 .308 Win Nitride Rifle Full Build Kit
$864.99 $549.99
Davidson Defense 'Avathar' 16
Davidson Defense 'Avathar' 16" AR-15 .223 Nitride Rifle Complete Upper Build Kit
$574.99 $289.99
Davidson Defense 'Reasonable' 16
Davidson Defense 'Reasonable' 16" AR-15 5.56 NATO Manganese Phosphate Rifle Full Build Kit
$609.99 $324.99
Bear Creek Arsenal Complete 20
Bear Creek Arsenal Complete 20" .243 Winchester Rifle Upper Assembly
$434.99 $394.99
Davidson Defense 'Bayou Buster' 20
Davidson Defense 'Bayou Buster' 20" LR-308 .308 Win Stainless Rifle Full Build Kit
$789.99 $474.99
Davidson Defense 'Valiant' 16
Davidson Defense 'Valiant' 16" AR-15 9MM Nitride Full Build Kit
$669.99 $354.99
Davidson Defense 'Waylon' 16
Davidson Defense 'Waylon' 16" AR-15 .223 Nitride Rifle Full Build Kit
$679.99 $394.99
MMC Arms
MMC Arms "Silverstar" LR-308 Featuring Aero Precision M5 Style Upper 20" 6.5 Creedmoor 4150 CMV QPQ Nitride 1-8T Barrel 19" High Profile M-Lok Handguard (Assembled or Unassembled)
$859.99 $544.99
Davidson Defense 'Kabocha' 4
Davidson Defense 'Kabocha' 4" AR-15 9mm Nitride Pistol Complete Upper Build Kit
$554.99 $239.99
Davidson Defense 'Tarul' 13.7
Davidson Defense 'Tarul' 13.7" AR-15 5.56 NATO Nitride Pistol Upper Build Kit
$519.99 $234.99
MMC Arms 'Darjeeling' AR-15 Rifle Complete Upper Build Kit Featuring Davidson Defense Upper .223 Wylde 17
MMC Arms 'Darjeeling' AR-15 Rifle Complete Upper Build Kit Featuring Davidson Defense Upper .223 Wylde 17" 416R Stainless Steel 1-8T Barrel 15" M-Lok Handguard (Assembled or Unassembled)
$584.99 $299.99
MMC 'Nebulous' 20
MMC 'Nebulous' 20" LR-308 .308 Win Stainless Rifle Full Build Kit
$854.99 $539.99
Davidson Defense 'Heysel' 16
Davidson Defense 'Heysel' 16" AR-15 9MM Nitride Complete Upper Build Kit
$594.99 $279.99

Manufacturer

  1. Home
  2. AR-15 & AR-10 Build Kits
  3. Upper Builds by Caliber
  • .22 Mag AR-15 Upper Builds .22 Mag AR-15 Upper Builds
  • .22-250 LR-308/AR-10 Upper Builds .22-250 LR-308/AR-10 Upper Builds
  • .45 ACP AR-15 Upper Builds .45 ACP AR-15 Upper Builds
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  • 5.56 NATO AR-15 Upper Builds 5.56 NATO AR-15 Upper Builds
  • .300 Blackout AR-15 Upper Builds .300 Blackout AR-15 Upper Builds
  • 9mm AR-15 Upper Builds 9mm AR-15 Upper Builds
  • .223 Wylde AR-15 Upper Builds .223 Wylde AR-15 Upper Builds
  • 7.62x39 AR-15 Upper Builds 7.62x39 AR-15 Upper Builds
  • .458 SOCOM AR-15 Upper Builds .458 SOCOM AR-15 Upper Builds
  • .450 Bushmaster AR-15 Upper Builds .450 Bushmaster AR-15 Upper Builds
  • 6.5 Grendel AR-15 Upper Builds 6.5 Grendel AR-15 Upper Builds
  • 6mm ARC AR-15 Upper Builds 6mm ARC AR-15 Upper Builds
  • .350 Legend AR-15 Upper Builds .350 Legend AR-15 Upper Builds
  • .308 Winchester LR-308/AR-10 Upper Builds .308 Winchester LR-308/AR-10 Upper Builds
  • 6.5 Creedmoor LR-308/AR-10 Upper Builds 6.5 Creedmoor LR-308/AR-10 Upper Builds

Products [1226]

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Davidson Defense
Davidson Defense"Dakota" AR-15 Pistol Upper Receiver 7.5" 5.56 NATO 4150 CMV 1-7T Barrel 7" M-Lok Handguard (Assembled or Unassembled)
$589.99 $369.99 Sale
In Stock
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Davidson Defense
Davidson Defense "Compact" AR-15 Pistol Upper Receiver 7.5" 5.56 NATO 4150 CMV 1-7T Barrel 7" M-Lok Handguard (Assembled or Unassembled)
$474.99 $189.99 Sale
In Stock
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MMC Arms AR-15
MMC Arms AR-15 "Jackhammer" Rifle Kit .458 SOCOM 16" 4150 CMV Parkerized 1:14T HBAR Barrel Black Diamond Series 15" M-LOK Handguard
$614.99 $324.99 Sale
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MMC Arms
MMC Arms"Stryker" AR-15 Featuring Aero Precision Upper Receiver 16" .450 Bushmaster 1-24T 4150 CMV Barrel 15" M-Lok Handguard
$524.99 $299.99 Sale
In Stock
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Davidson Defense AR-15
Davidson Defense AR-15"Axe" Assembled Pistol Upper Receiver 7.5" 5.56 NATO Stainless 1-7T Barrel 7" M-Lok Handguard (Assembled or Unassembled)
$424.99 $229.99 Sale
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MMC Arms
MMC Arms"Tectonic" AR-15 Featuring Aero Precision Upper Receiver 16" .458 SOCOM 1-14T 4150 CMV Heavy Barrel 13.5" KeyMod Handguard (Assembled or Unassembled)
$499.99 $229.99 Sale
In Stock
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MMC Arms
MMC Arms"Earthquake" AR-15 Featuring An Anderson Upper Receiver 16" .450 Bushmaster 1-24T 4150 CMV Heavy Barrel 15" M-Lok Handguard (Assembled or Unassembled)
$789.99 $459.99 Sale
In Stock
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MMC Arms Top Shelf
MMC Arms Top Shelf"Terrier" AR-15 Featuring A Davidson Defense Upper Receiver 16" KAK Industries 9MM 1-10T QPQ Nitride Barrel 15" M-Lok Handguard (Assembled or Unassembled)
$489.99 $249.99 Sale
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MMC Arms
MMC Arms"Bronco" AR-15 Featuring Aero Precision Upper Receiver 16" 5.56 NATO 1-8T QPQ Nitride Colt Competition Barrel 15" M-Lok Handguard (Assembled or Unassembled)
$604.99 $319.99 Sale
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Davidson Defense 'VHS' 7.5
Davidson Defense 'VHS' 7.5" AR-15 5.56 NATO Phosphate Pistol Upper Build Kit
$474.99 $189.99 Sale
In Stock
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MMC Arms
MMC Arms"Scorcher" AR-15 Featuring Aero Precision Upper Receiver 18" Ultra-Match 6.5 Grendel 1-8T Stainless Heavy Barrel 15" KeyMod Handguard (Assembled or Unassembled)
$479.99 $259.99 Sale
Out of Stock
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MMC Arms
MMC Arms"Thunderreign" AR-15 Featuring Aero Precision Upper Receiver 16" .458 SOCOM 1-14T 4150 CMV Heavy Barrel 15" M-Lok Handguard (Assembled or Unassembled)
$604.99 $334.99 Sale
In Stock
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MMC Arms
MMC Arms"Cataclysm" AR-15 Featuring Aero Precision Upper Receiver 16" .458 SOCOM 1-14T 4150 CMV Heavy Barrel 15" M-Lok Handguard (Assembled or Unassembled)
$479.99 $259.99 Sale
In Stock
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MMC Arms
MMC Arms"Raw" AR-15 Featuring Aero Precision Upper Receiver 16" .458 SOCOM 1-14T 4150 CMV Heavy Barrel 15" M-Lok Handguard (Assembled or Unassembled)
$489.99 $264.99 Sale
In Stock
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MMC Arms
MMC Arms"Fiery Furnace" AR-15 Featuring Aero Precision Upper Receiver 16" .450 Bushmaster 1-24T 4150 CMV Heavy Barrel 15" KeyMod Handguard (Assembled or Unassembled)
$509.99 $309.99 Sale
Out of Stock
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MMC Arms
MMC Arms"Butch" AR-15 Featuring Aero Precision Upper Receiver 18" Ultra-Match .450 Bushmaster 1-24T 4150 CMV Heavy Barrel 16.5" M-Lok Handguard (Assembled or Unassembled)
$504.99 $259.99 Sale
Out of Stock
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Davidson Defense
Davidson Defense"Lil Titan" AR-15 Pistol Upper Receiver 7.5" 5.56 NATO 4150 CMV 1-7T Barrel 7" M-Lok Handguard (Assembled or Unassembled)
$484.99 $199.99 Sale
In Stock
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MMC Arms
MMC Arms"Elbrus" AR-15 Featuring Aero Precision Upper Receiver 16" .450 Bushmaster 1-24T 4150 CMV Heavy Barrel 15" M-Lok Handguard (Assembled or Unassembled)
$489.99 $314.99 Sale
In Stock
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MMC Arms
MMC Arms "Arame" AR-15 Featuring Anderson Upper Receiver 16" .458 SOCOM 4150 CMV 1-14T Heavy Barrel 15" KeyMod Handguard (Assembled or Unassembled)
$484.99 $259.99 Sale
In Stock
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Davidson Defense
Davidson Defense "Grackle" AR-15 Pistol Upper Receiver 4" 9MM QPQ Nitride 1-10T KAK Industries Barrel 4" M-Lok Handguard (Assembled or Unassembled)
$444.99 $209.99 Sale
In Stock
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MMC Arms
MMC Arms "Code Blue" LR-308 Featuring Aero Precision M5 Upper 24" Ultra-Match .308 WIN Stainless 1-10T Straight Fluted Heavy Bull Barrel 19" M-Lok Handguard (Assembled or Unassembled)
$674.99 $359.99 Sale
Out of Stock
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MMC Arms
MMC Arms "Solidus" LR-308 Featuring Aero Precision M5 Upper 24" Ultra-Match 6.5 Creedmoor Stainless 1-8T Straight Fluted Heavy Bull Barrel 19" M-Lok Handguard (Assembled or Unassembled)
$824.99 $499.99 Sale
Out of Stock
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Davidson Defense
Davidson Defense "Nueve" 4" AR-15 9MM Nitride Pistol Upper Build Kit
$599.99 $349.99 Sale
In Stock
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MMC Arms
MMC Arms "Solidago" AR-15 Featuring Aero Precision Upper Receiver 16" .458 SOCOM 1-14T 4150 CMV Heavy Barrel 15" M-Lok Handguard (Assembled or Unassembled)
$504.99 $304.99 Sale
Out of Stock
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