Tokyo Marui Desert Eagle. It's in use by member Headhunter.

Specifications

Adjustable hop-up.
Weight: 1.11kg.
Length: 270mm.
Capacity: 27 rounds.
Power: 348 fps.
Power source: Green gas.
Heavy blowback.
Semi auto.

Accessoires

None.

Practise

How does this side arm work in the field?
The blowback is heavy, espcially for an airsuft gun.
This airsoft gun works on green gas, so you have to use the appropriate kind of gas under cold conditions. The main reason for this sidearm is for military simulation and sometimes for CQB (Close Quarter Battle) whereby you yell "Pang" when too close in range (mostly inside 5 meter distance). When you use a sniper rifle or DMR your are obligated to have a sidearm too in Holland.
A review (in Dutch) can be found here by member Headhunter.