6.75" Upper 300Blk w/ GPX-7" Rail

300BLKOUT 6.75″ Upper w/Buzzsaw Comp & GPX-7″ Rail System


(300BLKOUT) 6.75″ Pistol Upper, w/GPX-7″ Rail System, M4 Nickel Boron Extension with SOT Titanium Buzzsaw Linear Compensator.

In stock



NITRIDE PREMIUM 6.75″ Pistol Upper w/M4 Nickel Boron Barrel Extension:

  • Barrel 4150 CrMoVa 300BLKOUT (7.62×35 Chamber)
  • 6.75″ 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
  • SOT Titanium Buzzsaw Linear Compensator
  • Will Cycle Supersonic Reliably (Subsonic may be too weak)

SOT GPX-7 Rail System:

The SOT (GPX-7)” Rail System has an overall length of 7.2; 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-7 Provides (2) QD  Sling Swivel Attachments Points that are integrated in rear and are machined into both the left and right sides.

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


  • Free Floating
  • CNC machined from 6061-T6 Aircraft Grade Aluminum
  • Single Piece Machined Extrusion
  • Weight: (8.3 oz. Just rail)  10.3 installed
  • (2) QD Scockets
  • Anti Rotation Design
  • Solid mount interface
  • Sleek Industrial Appearance
  • Mil-Spec 1913 Picatinny Rails
  • Mil-Spec Type III Hard Coat Anodized
  • Inside Diameter: 1.28 inches
  • Width: 2.09 inches
  • Provides a Continuous Upper Rail
  • Made in the USA by Special Ops Tactical
  • Includes: Barrel Nut, Shims, Hex Key, Instructions, Screws


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