10.5″ Upper with GPR-9 Rail System


10.5″ Carbine Upper, w/ GPR-9″ Rail System, M4 Nickel Boron Extension with A2 Flash Hider, Complete Nitride Gas System.

In stock



NITRIDE PREMIUM 10.5″ Pistol Upper w/ M4 Nickel Boron Barrel Extension

  • 10.5″ Carbine Barrel 4150 CrMoVa  (5.56 NATO Chamber)
  • Nitride Treated Barrel (inside & out)
  • CARBINE Gas System
  • 1:7 Twist Rate
  • 1/2×28 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 Carbine Gas Tube (Nitride Treated)
  • Nitride Micro Gas Block .750 (Nitride Treated)
  • SOT GPR-9″ Free Floating Rail System
  • Forged Charging Handle
  • A2 Flash Hider 1/2×28

GPR-9″  Rail System:

The SOTMFG (GPR-9)” Rail System has an overall length of 9.2″; It’s Enhanced features include a machined one piece billet aluminum extruded rail which is much stronger and more rigid than 2 piece rail systems. The GPX-9 Provides (4) QD  Sling Swivel Attachments Points integrated in rear that are machined into both the left and right sides. See more..


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