300BLKOUT 8.0″ Upper w/ GPX-7″ Rail System

Description

 300 BLKOUT 8″ Pistol Upper w/M4 Nickel Boron Barrel Extension:

• Barrel 4150 CrMoVa  300BLKOUT  (7.62×35 Chamber)
• 8.0″ Nitride Treated Barrel (inside & out)
• 1:7 Twist Rate
• 5/8×24 Thread Pitch
• Nickel Boron M4 Barrel Extension with Extended Feed Ramps
• Nitride M16 Bolt Carrier Group w/Logo (properly staked w/Grade 8 hardware)
• Nitride Gas Tube (Nitride Treated)
• Nitride Micro Gas Block .750 (Nitride Treated)
• Forged Charging Handle
• .30 Cal Phantom
• GPX 7″ Rail
• Inside Diameter of rail is: 1.28 inches