Ghost Firearms 5.5" 9mm Barreled Upper M-LOK Rail - OD Green

Manufactured by Ghost Firearms
Manufactured by Ghost Firearms
1 Review

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NOTE: This upper receiver has a barrel that is less than 16” in length and is intended for use in AR pistol or legal short-barreled rifle builds. Other configurations may violate Federal law.

This extremely short 5.5” barreled upper receiver from Ghost Firearms is chambered in 9x19mm and is the perfect match for a pistol lower receiver or a legal short-barreled rifle. All that is needed to complete this build is a lower receiver set, 9mm bolt, standard Mil-Spec charging handle, and your favorite sights. The small size of this receiver set makes it an excellent choice for carrying in a backpack while hiking or home defense. The 7” M-LOK rail extends past the barrel but the included Ghost Firearms flash can fills the space inside the handguard giving your rifle a cool fake suppressor look. The flash can also vents excess gas forward every time a round is fired reducing felt recoil and muzzle flash. This option comes in olive drab green Cerakote finish but there are many other color choices to fit your style.

  • 5.5” HBAR profile barrel
  • Chambered in 9mm with 1:10 twist rate
  • Includes Ghost Firearms flash can
  • 7” Ghost Firearms M-LOK handguard with attachment points for your favorite accessories
  • Olive drab green Cerakote
  • Fits standard AR15 lowers (requires 9mm magazine conversion kit)
  • Made in the U.S.A. in Daytona Beach, Florida!
  • Compatible with 9mm lowers that use Glock or Colt magazines

The simplicity of the 9mm blowback design is the driving force behind this great system. It gets rid of the traditional AR15 rotating locking system and relies on the pressure of the 9mm bullet to cycle the action. Because the pressure is minimal, there is no need for a locking system to delay the bolt from moving rearward. This also makes it easier to take apart for cleaning and maintenance and reduces the risk of parts breakage resulting in a longer lifespan.

As a small, relatively new company, Ghost Firearms has made it their mission to provide a top-quality product, at an honest price while building relationships with customers through their customer service. They are able to provide products at such an affordable cost because of their relationships with some of America’s largest small arms manufacturers.

Notice from the manufacturer: “Ghost Firearms test fires every custom upper to verify cycling. We do not guarantee cycling with all ammunition due to vast differences in the quality of ammunition. We will only warranty cycling with US made ammunition. We will not warranty cycling with imported, steel cased or reloaded rounds.”
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AssemblyBarreled Assemblies
Barrel CoatingSalt Bath Nitride
Barrel ContourHBAR
Barrel Length5.5
Barrel Material4150 Chrome Moly Steel
BrandGhost Firearms
Caliber Gauge9mm Luger
Gas System TypeBlowback
Handguard7 in M-LOK Rail
Muzzle DeviceGhost Firearms Flash Can
Twist Rate1:10

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see

Ratings & Reviews

1 review

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Great upper.


i have around 500 rounds through it very accurate the fit and finish is very. The color is a bit darker than I expected but still looks great I added a black lower,green Magpul K2+ grip I love the rubber cover,green trigger guard,green ladder rail cover and a SigSauer red dot. It’s turning into one of my favorite pistols. Would definitely buy another one and recommend to a friend.