This Avatar/Weapons System is based on the ED209 Robot in Robocop (although with various differences such as the head mounted guns rather than arms.)

The robot has a built in anim overide including animations and sounds.

When you fly jets are fired through the feet.

The Robot is fitted with various weapons which can be fired in mouselook.
Touching the head section will bring up a menu with the following options.

Low Push - A low push machine gun ammo type, this will push an avatar in push enabled zones. It is not overly aggressive
High Push - This is a high push setting which will push an avatar some distance. It is not an orbit push.
No Harm - This setting will fire ammo which does neither damage, or push.
LDamage - Low damage setting, each hit will cause 1% health decrease on a target in a heath enabled zone
HDamage - High damage setting, one hit in a health enabled zone will cause 100% damage.
Missile - This will turn the machine guns off and switch over to Missiles. A missile will push and cause 50% damage. They are heat seeking. In the context of SL this meens that when fired, upon getting within a 10m radius of a avatar or physical target they will lock on.

You can also use these commands in chat to change weapons mode :

/1low push
/1high push
/1no harm
/1ldamage
/1hdamage
/1missile