10.5" Free-Floated KEYMOD .223 / 5.56 AR-15 Upper Receiver with SLR Rifleworks Adjustable Gas

$ 544.77

Building your own custom free-floated AR-15 Pistol upper receiver is a snap when you have all of the right parts. It's even easier when someone has already done the legwork to source all of the components, made sure they are of the highest quality and fit, BUILDS AND TESTS THE UPPER RECEIVER and then put them all into a nice little package for you. 

Well that's exactly what we have done and it's absolutely awesome! 

Each complete upper receiver sold by Ground Zero Precision is assembled by one of our certified AR-15 technicians to our rigorous specifications and comes ready to pop onto your lower receiver.

Components and Specifications:

Barrel - 

Ground Zero Precision's Premium 5.56 chambered 10.5 inch Lightning Series Barrel is precision CNC machined from 4150 Chrome Moly Vanadium steel with a corrosion resistant Parkerized finish and M4 feed ramp extension. Carbine length gas system.

Barrel Specifications:

Length 10.5"
Material 4150 Chrome Moly Vanadium
Profile Modern
Finish Corrosion Resistant Parkerized - Black
Gas System Length Carbine
Gas Block Journal .750"
Twist Rate 1:8
Muzzle 1/2 X 28 Threaded
Weight 15 oz

 

 Upper Receiver:

Ground Zero Precision upper receivers are manufactured for us in the United States by a major military and NASA contract to U. S. Military Specification. Forged from 7075 T-6 Aluminum and hard coat type III class III anodized in matte black for durability and reliability in the most extreme of environments.

Upper Receiver Materials and Specifications:

  • Manufactured to U. S. Mil-Spec
  • Forged 7075 T-6 Aluminum
  • M4 Upper Receiver with M4 Feed Ramps
  • 1913 Picatinny Rail Flat Top
  • Multi-Caliber Capable
  • Hard Coat Anodize Type III Class II to MIL-A-8625
  • Matte Black Finish
  • Mil-Spec Ejection Port Cover
  • Mil-Spec Ejection Port Hinge Pin
  • MIl-Spec Ejection Port Hinge Pin C-clip
  • Mil-Spec Ejection Port Spring
  • MIl-Spec "Target" Forward Assist - Salt Bath QPQ Nitride Finish
  • Mil-Spec Forward Assist Spring

Additional Components and Specifications:

  • Phosphate Bolt Carrier Group (Option 1): Ground Zero Precision Dead Bolt +P Premium Full-Mass Bolt Carrier Group - Carrier: 8620 Steel, Black Phosphate finish, Chrome Lined, Magnetic Particle Inspected, High Pressure Tested - No Logo, Bolt: 158 Carpenter Steel, Magnetic Particle Inspected, High Pressure Tested, Black Phosphate Finish, Gas Key: 4041 Steel, Grade 8 Fasteners, Staked to Mil-Spec
  • Nib Bolt Carrier Group (Option 2): Ground Zero Precision Dead Bolt +P Premium Full-Mass Bolt Carrier Group - Carrier: 8620 Steel, Nickel Boron finish, Chrome Lined, Magnetic Particle Inspected, High Pressure Tested, Bolt: 158 Carpenter Steel, Magnetic Particle Inspected, High Pressure Tested, Nickel Boron Finish, Gas Key: 4041 Steel, Grade 8 Fasteners, Staked to Mil-Spec
  • 1/2 X 28 "Bird Cage" Flash Suppressor - Salt Bath QPQ Nitride Finish
  • Mil-Spec Charging Handle - 7075 T-6 Aerospace Grade Aluminum, Hard Coat Anodized (Black) to MIL-A-8625
  • Seamless Stainless Steel Carbine Length Gas Tube
  • SLR Rifleworks Sentry 7 Adjustable Micro Gas Block - .750 Dia., 4140 Steel Block with 4140 Nexturn Swiss Metering Screw, QPQ Salt Bath Nitride Finish - Black
  • Ground Zero Precision Tac-Hunter 10 Keymod Free-Float Handguard

 

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