The USP is a popular H&K pistol. Umarex USA offers a couple of version in their airsoft line.  Umarex 2273001 Heckler & Koch Soft Air UPS Pistol Clear

• Caliber: 6 mm
• Action: Single
• Power: Spring
• Barrel Length: 4
• Brand: Heckler & Koch
• Safety Type: Manual
• Rear Sight Type: Fixed Notch
• Front Sight Type: Fixed Blade
• Barrel Type : Smooth
• Trigger Type: Single
• Ammo Type: Airsoft BB
• Velocity- FPS: 240
• Umarex 2273001

Caliber:  6 mm
Action:  Single
Power:  Spring
Barrel Length:  4
Brand:  Heckler & Koch
Safety Type:  Manual
Rear Sight Type:  Fixed Notch
Front Sight Type:  Fixed Blade
Barrel Type :  Smooth
Trigger Type:  Single
Ammo Type:  Airsoft BB
Velocity- FPS:  240
Umarex 2273001