KWC Sigma SW40F CO2 Blowback BB Pistol Table Top Review


Type: Air Pistol.

Manufacturer: KWC

Model:SW40F (S&W Sigma)

Materials: Metal slide, plastic frame.

Weight: 1.9 pounds (900 grams).

Barrel: Metalnon-rifled smooth bore.

Propulsion: 12 gram CO2.

Action: Single action only.

Ammunition Type: 4.5mm Steel BB's.

Ammunition Capacity: 19 rounds.

FPS: 330 fps.

Trigger Pull: The trigger pull on the KWC Sigma SW40F CO2 Blowback BB Pistol is single action only which generally produces a very light trigger, on the SW40F it is a bit firmer than most single actions but still decent with a short take-up and firm release. You will need to pull the slide back (which also chambers your first round) to cock the internal hammer, after which subsequent shots you will not have to pull the slide back as the blowback action does this for you.

Accuracy: When I shot the KWC Sigma SW40F from 20 feet out in semi rested position I was able to get nice clean results. I placed 10 rounds within about 2 inches with the shot placement being very well centered. The KWC S&W Sigma SW40F seemed to keep the rounds tighter from top to bottom over side to side for me. I also noticed when I field stripped this gun that there is a built in hop-up (rubber bar) that sits inside the barrel, this will produce some back spin which will keep the BB's trajectory a bit flatter when shooting further out and is also probably there to stop BB's from rolling out of the barrel once chambered.

Build Quality: The build quality is about the same as all other KWC guns, tolerances seem tight and everything is working as it should, you will get some wear marks (paint wear) on the high spots over time which is normal on just about any (type of gun, real or air) but what I like about the SW40F is that the barrel is polished and since this is the first area to lose paint, it really does not matter since no paint is on the barrel.

Realism: The KWC Sigma SW40F CO2 Blowback BB Pistol is a replica of the real steel S&W Sigma with the exception of the licensing and it really is a bang on Replica, you can field strip this gun exactly like a real Smith & Wesson Sigma. All the mechanical parts work just the same and I like the fact that without the licensing, this gun is very clean looking with no obtrusive warning instructions on it.

Available in the: -Replica Airguns Store in Canada
-Replica Airguns Store in the US


  • Lots of metal in this gun with very good weight to it.

  • Very accurate S&W Sigma replica.

  • Heavy crisp blowback feel.

  • Predictable single action trigger.

  • Shots where well centered, got good accuracy.

  • White dot sights for quick target acquisition.

  • No ugly warning markings.

  • Full size drop out magazine holds BB's and CO2.

  • Like the polished barrel and ejection port.

  • Fully field strip-able.


  • I only got two magazines in my pre-test for some reason?

  • FPS is not super high?

  • A bit finicky when loading BB's


Just like my Airsoft review of the KWC Sigma SW40F, this blowback Air Pistol was a lot of fun to shoot, with it's super snappy heavy slide and ultra realistic shooting characteristics. It did seem to go through a lot of CO2 very quickly which is not uncommon for this style of full blowback heavy slided airgun, and to be honest I don't really mind since it shot well, felt good in the hand and backs it up with great looks. And heck it's still so much cheaper to shoot than a real 9mm hand gun ;) For those of you looking for something that is similar to a Glock in terms of looks and operation, the KWC Sigma BB or Airsoft pistol may be your only real option here in North America now that the Umarex SA177 is history. 

My YouTube Table Top  Review of the KWC Sigma SW40F Blowback CO2 BB Pistol:

4.5mm / .177 cal, BB, Blowback, CO2, Field Test, Pistol, Review, Semi Auto, YouTube Video KWA, SW40F