Ray-Gun?

The ray-gun is essentially nothing but a upgraded microwave emitter that can be adjusted. This weapon is currently defined as a 'Non-Lethal' Weapon and is to be used in crowd control. This of course is curious since the Microwave emitter could have many side-effect, which are not known at this point but nonetheless this weapon is now facing fielding. The problem is that if this emitter is upgraded a bit it easily can become an offensive and very lethal weapon.
Here is some more background information...
1 360-degree operation for maximum effect
Antenna, linked to transmitter unit, can be mounted on vehicle
Automatic target tracking
2 Antenna sealed against dust and can withstand bullet fire
3 Invisible beam of millimeter-wave energy can travel over 500m
4 Heat energy up to 54C (130F) penetrates less than 0.5mm of skin
Manufacturers say this avoids injury, although long-term effects are not known

Relating article.
How hot is the heat-ray gun? (BBC)