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AR-15 & AR-10 Build Kits
Upper Builds by Caliber
.300 Blackout AR-15 Upper Builds

.300 Blackout AR-15 Upper Builds

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Top Sellers

Team Accessories Corp. Polymer Micro - Vertical Forward Grip with screws and nuts

~~$17.99~~ $9.99

New Releases

Davidson Defense 'Flying Dutchman' 16-inch AR-15 10mm Rifle Complete Upper Build

Davidson Defense 'Flying Dutchman' 16-inch AR-15 10mm Rifle Complete Upper Build

Free Shipping

~~$404.99~~ $254.99

Davidson Defense 'Gondolin' 16-inch AR-15 .45 ACP Phosphate Rifle Complete Upper Build

Davidson Defense 'Gondolin' 16-inch AR-15 .45 ACP Phosphate Rifle Complete Upper Build

~~$384.99~~ $239.99

Davidson Defense 'Rhovanion' 16-inch AR-15 .45 ACP Phosphate Rifle Complete Upper Build

Davidson Defense 'Rhovanion' 16-inch AR-15 .45 ACP Phosphate Rifle Complete Upper Build

Free Shipping

~~$424.99~~ $264.99

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80% Upper Build Kits > .300 Blackout
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 [116]

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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

In Stock

Davidson Defense

Davidson Defense "Raptor Claw" AR-15 Pistol Upper Receiver 7.5" .300 Blackout 4150 CMV 1-8T Heavy Barrel 7" M-Lok Handguard (Assembled or Unassembled)

~~$469.99~~ $254.99 Sale

In Stock

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

In Stock

Davidson Defense 'Granite' 16

Davidson Defense 'Granite' 16" AR-15 .300 Blackout Manganese Phosphate Upper Build Kit

~~$519.99~~ $204.99 Sale

In Stock

Davidson Defense 'Mayflower' 16

Davidson Defense 'Mayflower' 16" AR-15 .300 Blackout Manganese Phosphate Upper Build Kit

~~$524.99~~ $209.99 Sale

In Stock

Davidson Defense 'Nerine' 16

Davidson Defense 'Nerine' 16" AR-15 .300 Blackout Manganese Phosphate Upper Build Kit

~~$524.99~~ $209.99 Sale

In Stock

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 Sale

In Stock

Davidson Defense 'Frankfort' 10.5

Davidson Defense 'Frankfort' 10.5" AR-15 .300 Blackout Manganese Phosphate Pistol Upper Build Kit

~~$254.99~~ $159.99 Sale

In Stock

Davidson Defense

Davidson Defense "Trypetidae" AR-15 Pistol Upper Receiver 7.5" .300 Blackout 4150 CMV QPQ Nitride 1-8T Barrel 7" M-Lok Handguard (Assembled or Unassembled)

~~$579.99~~ $234.99 Sale

In Stock

Davidson Defense

Davidson Defense "Pseudechis" 16" AR-15 .300 BLK OUT Nitride Upper Build Kit

~~$679.99~~ $309.99 Sale

In Stock

Davidson Defense

Davidson Defense "Golden Eagle" AR-15 Upper Receiver 16" .300 Blackout 4150 CMV QPQ Nitride 1-8T Barrel 15" M-Lok Handguard (Assembled or Unassembled)

~~$619.99~~ $389.99 Sale

In Stock

Davidson Defense

Davidson Defense "Golden Eagle" AR-15 Upper Receiver 16" .300 Blackout 4150 CMV QPQ Nitride 1-8T Barrel 15" M-Lok Handguard (Assembled or Unassembled)

~~$494.99~~ $309.99 Sale

In Stock

Davidson Defense

Davidson Defense "Golden Eagle" AR-15 Upper Receiver 16" .300 Blackout 4150 CMV QPQ Nitride 1-8T Barrel 15" M-Lok Handguard (Assembled or Unassembled)

~~$364.99~~ $229.99 Sale

In Stock

Davidson Defense 'Pista' 7.5

Davidson Defense 'Pista' 7.5" AR-15 .300 Blackout Manganese Phosphate Pistol Full Build Kit

~~$604.99~~ $379.99 Sale

In Stock

Davidson Defense 'Vapor' 7.5

Davidson Defense 'Vapor' 7.5" AR-15 .300 Blackout Manganese Phosphate Pistol Full Build Kit

~~$604.99~~ $379.99 Sale

In Stock

Davidson Defense 'Granite' 16

Davidson Defense 'Granite' 16" AR-15 .300BLK Manganese Phosphate Rifle Full Build Kit

~~$479.99~~ $299.99 Sale

In Stock

Davidson Defense 'Nerine' 16

Davidson Defense 'Nerine' 16" AR-15 .300BLK Manganese Phosphate Rifle Full Build Kit

~~$479.99~~ $299.99 Sale

In Stock

OTD 'Lightshow II - Gold .300 Blackout' 16-inch AR-15 .300BLK Nitride Rifle Full Build Kit

OTD 'Lightshow II - Gold .300 Blackout' 16-inch AR-15 .300BLK Nitride Rifle Full Build Kit

~~$609.99~~ $399.99 Sale

In Stock

OTD 'Lightshow II - Grey .300 Blackout' 16-inch AR-15 .300BLK Nitride Rifle Full Build Kit

OTD 'Lightshow II - Grey .300 Blackout' 16-inch AR-15 .300BLK Nitride Rifle Full Build Kit

~~$619.99~~ $389.99 Sale

In Stock

OTD 'Lightshow II - Grey .300 Blackout' 16-inch AR-15 .300BLK Nitride Rifle Complete Upper Build Kit

OTD 'Lightshow II - Grey .300 Blackout' 16-inch AR-15 .300BLK Nitride Rifle Complete Upper Build Kit

~~$484.99~~ $304.99 Sale

In Stock

OTD 'Lightshow II - Gold .300 Blackout' 16-inch AR-15 .300BLK Nitride Rifle Complete Upper Build Kit

OTD 'Lightshow II - Gold .300 Blackout' 16-inch AR-15 .300BLK Nitride Rifle Complete Upper Build Kit

~~$474.99~~ $309.99 Sale

In Stock

OTD 'Lightshow II - Gold .300 Blackout' 16-inch AR-15 .300BLK Nitride Rifle Upper Build Kit

OTD 'Lightshow II - Gold .300 Blackout' 16-inch AR-15 .300BLK Nitride Rifle Upper Build Kit

~~$349.99~~ $229.99 Sale

In Stock

OTD 'Lightshow II - Grey .300 Blackout' 16-inch AR-15 .300BLK Nitride Rifle Upper Build Kit

OTD 'Lightshow II - Grey .300 Blackout' 16-inch AR-15 .300BLK Nitride Rifle Upper Build Kit

~~$359.99~~ $224.99 Sale

In Stock

OTD 'Lightshow II - Black .300 Blackout' 16-inch AR-15 .300BLK Nitride Rifle Full Build Kit

OTD 'Lightshow II - Black .300 Blackout' 16-inch AR-15 .300BLK Nitride Rifle Full Build Kit

~~$609.99~~ $399.99 Sale

In Stock

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