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Top Sellers

Davidson Defense 'Kabocha' 4
Davidson Defense 'Kabocha' 4" AR-15 9MM NIT Upper Build Kit
$479.99 $159.99
Davidson Defense
Davidson Defense "Sand Wasp" AR-15 Pistol Upper Receiver 7.5" .300 Blackout 4150 CMV QPQ Nitride 1-8T Barrel 7" M-Lok Handguard (Assembled or Unassembled)
$619.99 $199.99
Davidson Defense 'Kismet' 18
Davidson Defense 'Kismet' 18" AR-15 .350 Legend NIT Upper Build Kit
$534.99 $219.99
Davidson Defense
Davidson Defense "Ratchet" 8" AR-15 9MM Pistol Nitride Upper Build
$489.99 $174.99
MMC 'Gunnit' 20
MMC 'Gunnit' 20" AR-15 6.5 Grendel Nitride Upper Build Kit
$594.99 $279.99
Davidson Defense 'Split' 18
Davidson Defense 'Split' 18" AR-15 .350 Legend NIT Upper Build Kit
$554.99 $239.99
Davidson Defense
Davidson Defense "Servilius" AR-15 Pistol Upper Receiver 8" 9MM 4150 CMV QPQ Nitride 1-10T Barrel 7" M-Lok Handguard (Assembled or Unassembled)
$504.99 $189.99
Davidson Defense 'Saetta' 16.5
Davidson Defense 'Saetta' 16.5" AR-15 9MM NIT Upper Build Kit
$504.99 $189.99
MMC 'Red Mercury' 7.5
MMC 'Red Mercury' 7.5" AR-15 7.62x39 Pistol Nitride Upper Build Kit
$514.99 $199.99
Davidson Defense
Davidson Defense "Black Skimmer" AR-15 Pistol Upper Receiver 4" 9MM
$429.99 $199.99
Davidson Defense 'Bantam' 6
Davidson Defense 'Bantam' 6" AR-15 9MM Pistol Nitride Upper Build Kit
$514.99 $199.99
Davidson Defense 'Delicata' 4
Davidson Defense 'Delicata' 4" AR-15 9MM NIT Upper Build Kit
$484.99 $169.99
MMC 'Broose' 16
MMC 'Broose' 16" AR-15 9MM Nitride Upper Build Kit
$624.99 $309.99
MMC 'Zamor' 16
MMC 'Zamor' 16" AR-15 5.56 NATO Nitride Rifle Upper Build Kit
$614.99 $299.99
Davidson Defense
Davidson Defense "Desman" AR-15 Pistol Upper Receiver 10.5" .300 Blackout 4150 CMV QPQ Nitride 1-8T Barrel 9.25" M-Lok Handguard (Assembled or Unassembled)
$594.99 $239.99
Davidson Defense
Davidson Defense "Savannah" AR-15 Pistol Upper Receiver 5" 9MM 416R Stainless 1-10T ODIN Works Barrel 7" M-Lok Handguard (Assembled or Unassembled)
$549.99 $234.99

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AR-15 & LR-308/AR-10 | Upper Build Kits

  • Shop by Caliber | AR-15 & LR-308/AR-10 Upper Build Kits
  • Pistol Length - All Calibers | AR-15 & LR-308/AR-10 Upper Build Kits
  • Rifle Length - All Calibers | AR-15 & LR-308/AR-10 Upper Build Kits

Products [362]

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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"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"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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Davidson Defense
Davidson Defense"Toothpick" AR-15 Pistol Upper Receiver 4" 9MM QPQ Nitride 1-10T KAK Industries Barrel 4" M-Lok Handguard (Assembled or Unassembled)
$409.99 $214.99 Sale
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MMC Arms Top Shelf
MMC Arms Top Shelf"Thumper" AR-15 Pistol Featuring Aero Precision Upper Receiver 10.5" .450 Bushmaster 1-24T 4150 CMV Heavy Barrel Premium 10" KeyMod Handguard (Assembled or Unassembled)
$504.99 $284.99 Sale
Out of 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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MMC Arms
MMC Arms"Mini Sledge" AR-15 Featuring Aero Precision Upper Receiver 10.5" .450 Bushmaster 1-24T 4150 CMV Heavy Barrel 10" KeyMod Handguard (Assembled or Unassembled)
$549.99 $284.99 Sale
Out of Stock
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Davidson Defense
Davidson Defense "Black Skimmer" AR-15 Pistol Upper Receiver 4" 9MM
$429.99 $199.99 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 "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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Davidson Defense
Davidson Defense "Grave" AR-15 Upper Receiver 16" 5.56 NATO 4150 CMV 1-7T Heavy Barrel 12" M-Lok Handguard (Assembled or Unassembled)
$464.99 $289.99 Sale
In Stock
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MMC Arms
MMC Arms "Loon" LR-308 Featuring Aero Precision M5 Upper 22" 6.5 Creedmoor 4150 CMV QPQ Nitride 1-8T Barrel 16.5" M-Lok Handguard (Assembled or Unassembled)
$644.99 $319.99 Sale
Out of Stock
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Davidson Defense
Davidson Defense "Forsaken" AR-15 Upper Receiver 18" .350 Legend 4150 CMV 1-16T Heavy Barrel 13.5" M-Lok Handguard (Assembled or Unassembled)
$484.99 $289.99 Sale
Out of Stock
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Ace High Arms
Ace High Arms "Devilfish" AR-15 Upper Receiver 16" .458 SOCOM 4150 CMV Barrel 12" M-Lok Handguard (Assembled or Unassembled)
$479.99 $239.99 Sale
In Stock
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1 2 3 4 5 6 7 ...23 Next Page View All
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