Not really... We have a tank, and we have machineguns.
Think of it as this;
An item classed as a vehicle (If possible) Or just an equipable 1-time-use item, which you place down.
It could work with Space Guys TDM Add-On
It is set for a certain team
It is possible to pick it up with the Gravity gun Add-On
You pick it up and go and place it on the ground in a defensive area (In "capture the flag style" games)
Any enemies that come in a certain radius, it fires upon.
It has a set health (probably about 50-70) and once it is blown up it respawn from the respawn brick
It must be re-picked up to be activated again.
That might not be exactly what you are looking for, but it sure is an idea that i want now.mIm just imagining it as similar to the turrets in Half-Life 2, and Portal.