16″ Midlength Upper w/ GPX-12″ Rail


16Midlength Upper with 12.6″ GPX Rail System, M4 Nickel Boron Extension with A2 Flash Hider.

In stock


(Nitride Premium)


  • Barrel 16″
  • Barrel Steel 4150 CMV
  • Chambered in 5.56 NATO
  • Premium Nitride Treatment inside and out (Barrel)
  • {Nickel Boron} M4 Extended Feed Ramps
  • Nickel Boron M4 Barrel Extension
  • 6 Groove rifling for increased accuracy
  • 1:7 Twist Rate
  • MIDLENGTH Gas System with Nitride Gas Tube
  • 1/2×28 Thread Pitch
  • Tuned Gas Port
  • Target Crown
  • Nitride Treated Micro Gas Block with .750 seat
  • Forged Upper
  • Hand guard type: SOT GPX-12.6″ Free Floating Rail System (Milled Sides)
  • Shot peened and MPI tested bolt
  • Nitride M16 Bolt Carrier with properly staked carrier key
  • Forged Charging Handle
  • A2 Flash Suppressor
  • Custom Barrel Profile

SOT 12″ GPX Rail System:

The SOT (GPX-12)” Rail System has an overall length of 12.6″; Enhanced features include a machined one piece aluminum extruded rail which is much stronger and more rigid than 2 piece rail systems. The GPX-12 Provides (6) Sling Swivel Attachment Points; (2) Front, and (4) Rear that are integrated into both the left and right sides.

Designed to be used in with a (Micro/Low Profile Gas Block) on a (Carbine length or Midlength gas system) or (Front Sight Base with Rifle gas system). This rail system gives the user a more ” rigid” way to mount various accessories available to their AR15 platform. See more..


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