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.300 Blackout Upper Receivers

1-24 of 40 Products
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Aero Precision M4E1 Threaded 10" .300 Blackout Complete Upper Receiver with 9" ATLAS R-ONE Handguard - Anodized Black - APAR700702M4

Aero Precision M4E1 Threaded 10" .300 Blackout Complete Upper Receiver with 9" ATLAS R-ONE Handguard - Anodized Black - APAR700702M4
$556 21
In Stock
Only 3 Left!
Tacfire .300 Blackout 16" AR-15 Complete Upper Receiver with Bolt Carrier Group, Charging Handle, and M-LOK Handguard - BU-300-16

Tacfire .300 Blackout 16" AR-15 Complete Upper Receiver with Bolt Carrier Group, Charging Handle, and M-LOK Handguard - BU-300-16
$274 98
In Stock
Aero Precision M4E1 Threaded 8" .300 Blackout Complete Upper Receiver w/ ATLAS R-ONE Handguard - Anodized Black - APAR700701M1

Aero Precision M4E1 Threaded 8" .300 Blackout Complete Upper Receiver w/ ATLAS R-ONE Handguard - Anodized Black - APAR700701M1
$534 99
In Stock
Only 6 Left!
CMMG 30BC239AB Dissent MK4 300 Blackout 10.50", Left Side Charging Handle, Armor Black, OEM Zeroed Linear Comp, 9.60" M-LOK Handguard for AR-Platform, Picatinny End Plate

CMMG 30BC239AB Dissent MK4 300 Blackout 10.50", Left Side Charging Handle, Armor Black, OEM Zeroed Linear Comp, 9.60" M-LOK Handguard for AR-Platform, Picatinny End Plate

$1297 89
In Stock
Only 3 Left!
Aero Precision M4E1 Enhanced 16" .300 Blackout Complete Upper Receiver with 15" Enhanced M-LOK Handguard - Cerakote FDE - APAR640252M14

Aero Precision M4E1 Enhanced 16" .300 Blackout Complete Upper Receiver with 15" Enhanced M-LOK Handguard - Cerakote FDE - APAR640252M14
$629 99
In Stock
Only 3 Left!
Aero Precision M4E1 Threaded 10" .300 Blackout Complete Upper Receiver with 9" ATLAS S-ONE Handguard - Anodized Black - APAR700302M4

Aero Precision M4E1 Threaded 10" .300 Blackout Complete Upper Receiver with 9" ATLAS S-ONE Handguard - Anodized Black - APAR700302M4
$554 99
In Stock
Only 5 Left!
Tacfire .300 Blackout 10" AR-15 Complete Upper Receiver with Bolt Carrier Group, Charging Handle, and M-LOK Handguard - BU-300-10

Tacfire .300 Blackout 10" AR-15 Complete Upper Receiver with Bolt Carrier Group, Charging Handle, and M-LOK Handguard - BU-300-10
$267 18
In Stock
CMMG 30BC40AAB Resolute MK4 300 Blackout 16.10", Armor Black, M-LOK Free-Float Handguard for AR-Platform (No BCG or Charging Handle)

CMMG 30BC40AAB Resolute MK4 300 Blackout 16.10", Armor Black, M-LOK Free-Float Handguard for AR-Platform (No BCG or Charging Handle)

$449 41
In Stock
Only 4 Left!
CMMG 30BC40AMB Resolute MK4 300 Blackout 16.10", Midnight Bronze, M-LOK Free-Float Handguard for AR-Platform (No BCG or Charging Handle)

CMMG 30BC40AMB Resolute MK4 300 Blackout 16.10", Midnight Bronze, M-LOK Free-Float Handguard for AR-Platform (No BCG or Charging Handle)

$449 41
In Stock
Only 4 Left!
Aero Precision M4E1 Threaded 16" .300 Blackout Complete Upper Receiver with 16" ATLAS R-ONE Handguard - Anodized Black - APAR700705M14

Aero Precision M4E1 Threaded 16" .300 Blackout Complete Upper Receiver with 16" ATLAS R-ONE Handguard - Anodized Black - APAR700705M14

$594 99
In Stock
Only 2 Left!
Aero Precision M4E1 Threaded 16" .300 Blackout Complete Upper Receiver with 15" ATLAS S-ONE Handguard - Cerakote FDE - APAR700315M14

Aero Precision M4E1 Threaded 16" .300 Blackout Complete Upper Receiver with 15" ATLAS S-ONE Handguard - Cerakote FDE - APAR700315M14

$629 99
In Stock
Only 1 Left!
Radian Weapons R0027 Complete Upper 9" 300 Blackout Black

Radian Weapons R0027 Complete Upper 9" 300 Blackout Black

$1829 95
In Stock
Only 5 Left!
Aero Precision M4E1 Enhanced 8" .300 Blackout Complete Upper Receiver - Anodized Black - APAR640211M1

Aero Precision M4E1 Enhanced 8" .300 Blackout Complete Upper Receiver - Anodized Black - APAR640211M1
Out of Stock
Aero Precision M4E1 Enhanced 10" .300 Blackout Pistol Length Complete Upper Receiver with 9.3" Enhanced Handguard, Adjustable Gas Block, BREACH Charging Handle, & PRO Series BCG - Anodized Black - APSL100392

Aero Precision M4E1 Enhanced 10" .300 Blackout Pistol Length Complete Upper Receiver with 9.3" Enhanced Handguard, Adjustable Gas Block, BREACH Charging Handle, & PRO Series BCG - Anodized Black - APSL100392

Out of Stock
Radical Firearms Complete 8.5" .300 Blackout Upper, HBAR w/ 7" M-LOK RPR Rail - CFU8.5-300HBAR-RPR

Radical Firearms Complete 8.5" .300 Blackout Upper, HBAR w/ 7" M-LOK RPR Rail - CFU8.5-300HBAR-RPR

Out of Stock
Aero Precision M4E1 Threaded 16" .300 Blackout Complete Upper Receiver with 15" ATLAS S-ONE Handguard - Anodized Black - APAR700305M14

Aero Precision M4E1 Threaded 16" .300 Blackout Complete Upper Receiver with 15" ATLAS S-ONE Handguard - Anodized Black - APAR700305M14
Out of Stock
Aero Precision M4E1 Enhanced 8" .300 Blackout Complete Upper Receiver with 7" Enhanced M-LOK Handguard - APAR640212M1

Aero Precision M4E1 Enhanced 8" .300 Blackout Complete Upper Receiver with 7" Enhanced M-LOK Handguard - APAR640212M1
Out of Stock
Tacfire .300 Blackout 5" AR-15 Complete Upper Receiver with Bolt Carrier Group, Charging Handle, M-LOK Handguard, and Adjustable Gas Block - BU-300-5

Tacfire .300 Blackout 5" AR-15 Complete Upper Receiver with Bolt Carrier Group, Charging Handle, M-LOK Handguard, and Adjustable Gas Block - BU-300-5

Out of Stock
Aero Precision M4E1 Threaded 16" .300 Blackout Complete Upper Receiver with 12" ATLAS S-ONE Handguard - Anodized Black - APAR700304M14

Aero Precision M4E1 Threaded 16" .300 Blackout Complete Upper Receiver with 12" ATLAS S-ONE Handguard - Anodized Black - APAR700304M14
Out of Stock
CMMG 30B0E67AB Dissent MK4 300 Blackout 6.50", Left Side Charging Handle, Armor Black, OEM Zeroed Linear Comp, 4.60" M-LOK Handguard for AR-Platform, Picatinny End Plate

CMMG 30B0E67AB Dissent MK4 300 Blackout 6.50", Left Side Charging Handle, Armor Black, OEM Zeroed Linear Comp, 4.60" M-LOK Handguard for AR-Platform, Picatinny End Plate

Out of Stock
Rock River Arms BLK0592 LAR-15M Coyote Carbine Complete Upper, 300 Blackout 16", Black, Aluminum Rec, 12.50" M-LOK Handgaurd, Smith Vortex Flash Hider

Rock River Arms BLK0592 LAR-15M Coyote Carbine Complete Upper, 300 Blackout 16", Black, Aluminum Rec, 12.50" M-LOK Handgaurd, Smith Vortex Flash Hider

Out of Stock
Aero Precision AR15 Complete Upper with 8" .300 Blackout Pistol QPQ Barrel & LOGIC 7" M-LOK Handguard - Anodized Black - BLEM - APSL100478B

Aero Precision AR15 Complete Upper with 8" .300 Blackout Pistol QPQ Barrel & LOGIC 7" M-LOK Handguard - Anodized Black - BLEM - APSL100478B

Out of Stock
Sons of Liberty M48930013.9 300 Blackout PW NOX NS MIL 13.9

Sons of Liberty M48930013.9 300 Blackout PW NOX NS MIL 13.9

Out of Stock
Aero Precision M4E1 Enhanced 10" .300 Blackout Complete Upper Receiver with 9" Enhanced M-LOK Handguard - Cerakote FDE - APAR640222M4

Aero Precision M4E1 Enhanced 10" .300 Blackout Complete Upper Receiver with 9" Enhanced M-LOK Handguard - Cerakote FDE - APAR640222M4
Out of Stock
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