Umarex Smith & Wesson M&P40 CO2 Blowback BB Pistol Table Top Review

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Type: BB air pistol.

Distributer: Umarex.

Model:Smith & Wesson M&P40.

Materials: Metal and polymer build.

Weight: 1.61 pounds (730 grams).

Barrel: 3.5 inchesBrass, non-rifled.

Propulsion: CO2 x1.

Action: Semi auto blowback, single action only.

Ammunition Type: 4.5mm Steel BB's.

Ammunition Capacity: 15 rounds.

FPS: 310.

Trigger Pull: The single action only trigger pull on the Umarex Smith & Wesson M&P40 CO2 Blowback BB Pistol is very nice, there is some take up required be for the release but the release or break point is very smooth, perhaps a little too smooth since there is no real noticeable resistance so you will have to get use to the range in the trigger pull in which the release takes place. Since there is no external hammer you will need to draw the slide back in order to cock the internal striker.

Accuracy: Make sure to checkout my full Field Test Shooting Video for the Umarex Smith & Wesson M&P40 CO2 Blowback BB Pistol where I test out this fun S&W M&P40 BB shooting replica by shooting some BB's through my chronograph and also at a paper target to find out how it performs. In summary I was able to get an average of around 300 fps and accuracy in the 2 inch size groupings from 30 feet away. Not bad for a full blowback short barrel CO2 BB pistol. It did shoot a little low so some manual target sighting adjustments may be required.

Build Quality: Very good, with metal and plastic construction where you would find it on the real steel S&W M&P40. I am fairly certain the  the Umarex Smith & Wesson M&P40 CO2 Blowback BB Pistol is made by KWC which has produce some other nice quality examples of other full blowback replica BB and Airsoft pistols. As with most KWC powder coated airguns, you will get some wear in the high spots of the finish over time but this is true even with real steel blued guns.

Realism: This is by far the best example of a 4.5mm BB shooting Smith & Wesson M&P out there, I have had several real steel M&P40 owners comment on how accurate this BB copy really is including how the barrel drops from its locked position and angles down and up during blowback operation. You even get interchangeable grip backstraps to accommodate different sized hands. And of course all the mechanical parts function as you would expect them to including being able to fully field strip the Umarex Smith & Wesson M&P40 CO2 Blowback BB Pistol

Available at the:Replica Airguns Store


  • Most accurate looking steel BB shooting replica of the S&W M&P40 to date.
  • Good weight and feel to it.
  • Metal and plastic parts where you would find them on the real steel version.
  • Realistic working safety and working slide catch and release.
  • Full size dropout metal magazine that holds BB's and CO2.
  • Can be field stripped like original Smith & Wesson M&P40.
  • Fully Smith & Wesson licensed via Umarex.
  • Rail for add on accessories.
  • White dot sight with adjustable front sight for windage.
  • Comes with three sizes of interchangeable grip backstraps.


  • FPS may be low for some people that like the more powerful CO2 pistols.
  • Shoots a bit low out of the box.
  • Ugly white warning instruction on the slide. 


Many of us have been waiting for a blowback Smith & Wesson M&P and now we have one. Thanks to Umarex, we also get it in a fully licensed version to make it even more realistic! Everything about the Umarex Smith & Wesson M&P40 CO2 Blowback BB Pistol is so very accurate to the real steel version other than of course the fact that it shoots 4.5mm Steel BB's using CO2 but isn't that why we are interested in it in the first place? If you are a Real Steel S&W M&P owner than you are going to have to get yourself one of these as a low cost and easily accessible training alternative. A great choice fro anyone else looking for an ultra realistic 4.5mm CO2 blowback pistol what ever your purpose is.

My YouTube Videos for the Umarex Smith & Wesson M&P40 CO2 Blowback BB Pistol:

4.5mm / .177 cal, BB, Blowback, CO2, Comparison, Pistol, Review, Semi Auto, YouTube Video S&W M&P, S&W M&P40, Umarex