Umarex Steel Storm BB Machine Gun Review


Type: BB machine gun
Manufacturer: Umarex.
Model: Steel Storm.
Materials: Polymer shell, metal inner frame, metal trigger, mainly metal CO2 magazine.
Weight: 2.8 pounds.
Barrel: 7.5 inches, metal, non-rifled.
Propulsion: CO2 x2.
Action: Semi auto, fully auto - 6 round burst, blowback.
Ammunition Type: Steel BBs 4.5mm.
Ammunition Capacity: 300 in internal hopper, 30 in spring fed magazine (hopper gravity feeds magazine when spring retracted).
FPS: 430.
Trigger Pull: Very light.
Accuracy: Excellent in both single shot and 6 round burst mode!
Build Quality: This airgun is made in Japan and even though the external shell is made out of polymer, it still has a very solid feel.
Realism: This gun is not a direct replica but it does share similarities to the HK MP7A1 (4.6x30mm).
Purchased this gun from: The Replica Airguns Store


  • Excellent value for the money.
  • Very accurate in both single and 6 round burst modes.
  • Super fun to shoot.
  • High rate of fire in full auto mode.
  • Picatinny rails on the top and bottom for accessories.
  • High FPS for a blowback gun.


  • Mainly polymer shell.
  • Uses lots of CO2 (to be expected)
  • No but-stock or way to add a but-stock.
  • No adjustable sites. (a Red Dot scope is perfect for this airgun)

The gun is plastic based but seems to be well built and has some weight to it. The design and functionality is well thought out and for the price of under $100 you can't rally ask for much more.

The rate of fire is fairly fast and there is only a small amount of blowback feel probably due to the weight of the gun. The Steel Storm is surprisingly loud, so shooting in a residential neighborhood may not be the best place to empty the two CO2 cartridges! I was able to get around 200 rounds from the dual CO2 cartridges, most of which were shot in full auto 6 round burst mode.

It would have been nice to have the BBs in the pull out magazine but the gravity fed hopper makes more sense feeding into the internal lower 30 round spring fed magazine.

The Umarex Steel Storm Full Auto CO2 BB Gun is very fun to shoot and is well worth the small amount of cost. So go get one!

My YouTube Videos for this Airgun:

4.5mm / .177 cal, BB, Blowback, CO2, Field Test, Full Auto, Pistol, Review, Rifle, Semi Auto, YouTube Video Steel Storm, Umarex