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Shop by Caliber > AR-15 & LR-308/AR-10 Upper Build Kits

Top Sellers

Davidson Defense 'Rosco Rizzo' 16-inch AR-15 5.56 NATO Nitride Rifle Upper Build Kit
Davidson Defense 'Rosco Rizzo' 16-inch AR-15 5.56 NATO Nitride Rifle Upper Build Kit
$239.99 $179.99
Davidson Defense 'Sawbones' 16.5-inch AR-15 5.56 NATO Nitride Rifle Upper Build Kit
Davidson Defense 'Sawbones' 16.5-inch AR-15 5.56 NATO Nitride Rifle Upper Build Kit
$254.99 $188.99
Davidson Defense 'Hot Hand Mid-Length' MMC Exclusive 16.5-inch AR-15 5.56 NATO Nitride Rifle Upper Build Kit (Handguard Ready)
Davidson Defense 'Hot Hand Mid-Length' MMC Exclusive 16.5-inch AR-15 5.56 NATO Nitride Rifle Upper Build Kit (Handguard Ready)
$214.99 $157.99
MMC Top Shelf
MMC Top Shelf "Ironstone" 16.5" AR-15 5.56 Nitride Upper Build Kit W/ Mercury Precision, Unique AR
$304.99
Davidson Defense 'Black Magic' 20-inch AR-15 5.56 NATO Phosphate Rifle Upper Build Kit
Davidson Defense 'Black Magic' 20-inch AR-15 5.56 NATO Phosphate Rifle Upper Build Kit
$244.99 $183.99
MMC Armory Exclusive 'Noble Slender' 16-inch AR-15 5.56 NATO Nitride Rifle Upper Build Kit - No Handguard
MMC Armory Exclusive 'Noble Slender' 16-inch AR-15 5.56 NATO Nitride Rifle Upper Build Kit - No Handguard
$209.99 $156.99
Davidson Defense 'Wide ARC' 18-inch AR-15 6mm ARC Nitride Rifle Upper Build Kit
Davidson Defense 'Wide ARC' 18-inch AR-15 6mm ARC Nitride Rifle Upper Build Kit
$274.99 $203.99
Davidson Defense 'BA-Boom V2' 18-inch LR-308 .308 Win Nitride Rifle Upper Build Kit
Davidson Defense 'BA-Boom V2' 18-inch LR-308 .308 Win Nitride Rifle Upper Build Kit
$409.99 $305.99
Davidson Defense 'G.I. Mod 1' 14.5-inch AR-15 5.56 NATO Phosphate Pistol Upper Build Kit
Davidson Defense 'G.I. Mod 1' 14.5-inch AR-15 5.56 NATO Phosphate Pistol Upper Build Kit
$209.99 $155.99
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)
$254.99 $159.99
Davidson Defense '9mm Lightshow - Black' 16
Davidson Defense '9mm Lightshow - Black' 16" AR-15 9mm Nitride Rifle Upper Build Kit
$274.99 $204.99
Davidson Defense 'Boston' 10.5
Davidson Defense 'Boston' 10.5" AR-15 .300 Blackout Manganese Phosphate Pistol Upper Build Kit
$264.99 $148.49
Davidson Defense 'Quantum of Solace w/ Rosco Bloodline Barrel' 16-inch AR-15 5.56 NATO Nitride Rifle Upper Build Kit
Davidson Defense 'Quantum of Solace w/ Rosco Bloodline Barrel' 16-inch AR-15 5.56 NATO Nitride Rifle Upper Build Kit
$214.99 $157.99
MMC 'Superflous' 16-inch AR-15 5.56 NATO Stainless Rifle Upper Build Kit
MMC 'Superflous' 16-inch AR-15 5.56 NATO Stainless Rifle Upper Build Kit
$244.99 $180.99
Preassembled Upper - Davidson Defense 'Moonstomper' 16-inch AR-15 .223 Wylde Parkerized Rifle Upper Build Kit
Preassembled Upper - Davidson Defense 'Moonstomper' 16-inch AR-15 .223 Wylde Parkerized Rifle Upper Build Kit
$204.99 $151.99
Davidson Defense
Davidson Defense "Aksum" AR-15 Upper Receiver 16" 9MM 4150 CMV QPQ Nitride 1-10T Barrel 15" M-Lok Handguard (Assembled or Unassembled)
$244.99 $183.99

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  • .223 Rem > AR-15 Upper Build Kits
  • 10MM > AR-15 Upper Build Kits
  • 12.7x42 > AR-15 Upper Build Kits
  • 5.56 NATO > AR-15 Upper Build Kit
  • .223 Wylde > AR-15 Upper Build Kits
  • .300 Blackout > AR-15 Upper Build Kits
  • 9mm > AR-15 Upper Build Kits
  • 7.62x39 > AR-15 Upper Build Kits
  • .458 SOCOM > AR-15 Upper Build Kits
  • .350 Legend > AR-15 Upper Build Kits
  • .450 Bushmaster > AR-15 Upper Build Kits
  • 6.5 Grendel > AR-15 Upper Build Kits
  • 6mm ARC > AR-15 Upper Build Kits
  • .308 Winchester > LR-308/AR-10 Upper Build Kits
  • 6.5 Creedmoor > LR-308/AR-10 Upper Build Kits

Products [357]

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Davidson Defense
Davidson Defense"Skylark" AR-15 Upper Receiver 16.5" Ultra-Match 5.56 NATO QPQ Nitride 1-7T Barrel 15" KeyMod Handguard (Assembled or Unassembled)
$469.99 $179.99 Sale
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Davidson Defense
Davidson Defense"Graveler" AR-15 Upper Receiver 16" 7.62x39 4150 CMV H-BAR 1-10T Barrel 15" KeyMod Handguard (Assembled or Unassembled)
$429.99 $254.99 Sale
In Stock
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MMC Customs
MMC Customs"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 Elite Series
MMC Arms Elite Series "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
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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
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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
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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
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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
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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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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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Davidson Defense
Davidson Defense "Coble" AR-15 Upper Receiver 20" .350 Legend 4150 CMV 1-16T Heavy Barrel 15" M-Lok Handguard (Assembled or Unassembled)
$494.99 $259.99 Sale
Out of Stock
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MMC Arms
MMC Arms "Ange" LR-308 Featuring Aero Precision M5 Upper 10.5" .308 WIN 4150 CMV QPQ Nitride Heavy Barrel 12" M-Lok Handguard (Assembled or Unassembled)
$529.99 $289.99 Sale
Out of Stock
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Davidson Defense
Davidson Defense "Sounder" AR-15 Pistol Upper Receiver 8" 9MM 4150 CMV QPQ Nitride 1-10T KAK Industries Barrel 7" KeyMod Handguard (Assembled or Unassembled)
$454.99 $224.99 Sale
Out of Stock
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MMC Arms
MMC Arms "Ladon" LR-308 Featuring Aero Precision M5 Upper 18" 6.5 Creedmoor 416R Stainless 1-8T Straight Fluted Heavy Barrel 16" M-Lok Handguard (Assembled or Unassembled)
$569.99 $334.99 Sale
Out of Stock
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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
In Stock
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MMC Arms
MMC Arms "Bunting" LR-308 Featuring Aero Precision M5 Upper 18" 6.5 Creedmoor 416R Stainless 1-8T Straight Fluted Heavy Barrel 16" M-Lok Handguard (Assembled or Unassembled)
$569.99 $329.99 Sale
Out of Stock
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MMC Arms Top Shelf
MMC Arms Top Shelf "Cobelodus" AR-15 Featuring Davidson Defense Upper Receiver 16" XX-Treme Barrel Company .350 Legend 4150 CMV 1-16T Barrel 12" Smooth Tube Unique AR Handguard (Assembled or Unassembled)
$599.99 $399.99 Sale
In Stock
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Davidson Defense
Davidson Defense "Reject" AR-15 Upper Receiver 16" .223 Wylde 4150 CMV 1-7T Barrel 15" M-Lok Handguard (Assembled or Unassembled)
$464.99 $264.99 Sale
In Stock
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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
In Stock
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Davidson Defense
Davidson Defense "Scaup" AR-15 Pistol Upper Receiver 7.5" 5.56 NATO 4150 CMV QPQ Nitride 1-7T Barrel 7" M-Lok Handguard (Assembled or Unassembled)
$454.99 $239.99 Sale
Out of Stock
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Davidson Defense
Davidson Defense "Crake" AR-15 Pistol Upper Receiver 4.5" .45 ACP 4150 CMV QPQ Nitride 1-16T Barrel 4" M-Lok Handguard (Assembled or Unassembled)
$454.99 $214.99 Sale
Out of Stock
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Davidson Defense
Davidson Defense "Brant" AR-15 Pistol Upper Receiver 8" .45 ACP 4150 CMV QPQ Nitride Barrel 7" M-Lok Handguard (Assembled or Unassembled)
$489.99 $239.99 Sale
Out of Stock
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Davidson Defense
Davidson Defense "Antpitta" AR-15 Pistol Upper Receiver 4.5" .45 ACP 4150 CMV 1-16T Barrel 4" M-Lok Handguard (Assembled or Unassembled)
$464.99 $199.99 Sale
Out of Stock
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