Decent air pistol for corporate events? - Co2 ideally

[Mauserman]

Hi All,

After having some really good feedback with regards to buying an air rifle for corporate events I am now looking to buy 4 air pistols for plinking.
I want to mix things up a bit, I have gone for the HW30 for the rifle side of things so thinking of maybe going for a Co2 powered pistol instead of a springer so there is a bit of variety.

I have done a bit of research and it would seem that the Crossman 2240 seems very popular, also the Umarex Smith and Wesson 586 in .177 but seems very pricey. Any of these recommended?

Are there any other pistols to consider which would fit the below requirements?

Either .177 or .22 pellet

User friendly with reliable build quality

Good gas efficiency on a 12 gram

Huge thanks in Advance

Mark