6.75" Upper With Firestorm 7" Mlok

(300BLK) 6.75″ Upper w/ FIRESTORM-7 M-LOK Rail System Recessed Buzzsaw


6.75″ Pistol Upper, w/ FIRESTORM-7″Rail System, M4 Nickel Boron Extension with SOT Buzzsaw Linear Compensator, Complete Nitride Gas System and more!

In stock



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

  • 6.75″ Barrel 4150 CrMoVa  300BLKOUT (7.62×35 Chamber)
  • 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)
  • FIRESTORM-7 M-LOK Free Floating Rail System
  • Forged Charging Handle
  • SOT Titanium Buzzsaw Linear Compensator
  • Will Cycle Supersonic Reliably (Sub-sonic too weak for this barrel)

SOT Firestorm-7″ (M-LOK) Rail System:

The SOT (Firestorm-7-M-LOK)” Rail System has an overall length of 7.2″. It’s Incredibly light weight! Weighing in at only 4.6 ounces!! The Firestorm is our newest cutting edge, highly refined rail system that blends state of the art custom precision CNC machining along with Ultra Sleek Stealth like design. This is not a flimsy rail! The Firestorm is machined out of a one piece billet aluminum extruded rail which is much stronger and more rigid than 2 piece rail systems. The Firestorm series boasts with sleek aggressive good looks as well as being tough enough to handle any mission all while weighing in at only 4.6 oz.! See more..


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