10.5" A4 AR-15 Upper Receiver w/ Pop-Up BUIS - Stainless

$ 382.49

Want one of our wildly popular A4 upper receivers but don't have the time or the tools to fool with building it yourself? We got you covered.

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

Every upper receiver we build must pass three thorough inspections and is test fired for functionality and accuracy.

Components and Specifications:

Barrel - 

Ground Zero Precision's Premium .223 / 5.56 "Wylde" chambered 10.5 inch Modern Contour Series Barrel is precision CNC machined from 416R stainless steel with a scratch resistant brushed finish and M4 feed ramp extension. Carbine length gas system.

Barrel Specifications:

Length 10.5"
Material 416R Stainless Steel, Heat Treated to 28-32 RC Hardness & Stress Releived
Profile Modern
Finish Brushed Stainless
Gas System Length Carbine
Gas Block Journal .750"
Twist Rate 1:8
Muzzle 1/2 X 28 Threaded
Weight 11.2 oz

 

 Upper Receiver:

Ground Zero Precision upper receivers are manufactured for us in the United States by a major military and NASA contractor 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
  • Ground Zero Precision Mod 2 .750 Same Plane Rail Height Railed Gas Block
  • Ground Zero Precision Polymer Pop-Up Front & Rear BUIS
  • Mil-Spec A2 style carbine length handguards with aluminum heat shield insert, mil-spec delta-ring barrel nut and end cap

 

PREVIOUS SKU: GZP-105-A2-COMP-WS