16" A4 AR15 Upper Receiver w/ Pop-Up BUIS
Want one of our wildly popular A4 Carbine Upper Receivers but don't have the time or the tools to fool with building it yourself? We got you covered.
Each of our complete upper receivers are hand assembled by one of our certified AR15 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. Please allow for additional order to ship time as we build these to order.
Includes all of the following:
- Ground Zero Precision A4 Flat-Top 7075-T6 Aluminum Upper Receiver
- 16" Parkerized Govt. Profile .223/5.56 Chambered, 1:8 twist Carbine Barrel
- Ground Zero Precision Premium Full-Mass Bolt Carrier Group - Slick Black Phosphate, Chrome Lined, Magnetic Particle Inspected, High Pressure Tested
- Ground Zero Precision Ultra-Light Polymer Pop-Up BUIS Sight Set (Front & Rear)
- Ground Zero Precision Mod 3 .750 Rail Height Railed Gas Block
- Stainless Carbine Length Gas Tube with Roll Pin
- A2 "Birdcage" 1/2-28 Flash Hider with Crush Washer
- Mil-Spec 7075-T6 Aluminum Charging Handle
- Dust Cover Door Assembly with Pin, C-Clip and Spring
- Target Forward Assist with Spring and Roll Pin
- A2 Style Carbine Length Hand Guards with Aluminum Heat Shielding
- A2 Style Round Hand Guard Cap
- A2 Barrel Nut - Standard AR-15
- A2 Delta Ring
- Weldon Spring
- Snap Ring