For those opposed to just opening up with machine guns:
Aerko International Clear Out 6oz Tear Gas Grenades are ideal for control and disbursement of crowds, or securing of a confined area. They are hand held units that are designed for throwing. The unique "Lock-On" style provides for a continuous discharge of the contents of the grenade. The unit will spin in a 360-degree circle if you throw it onto a hard surface, delivering maximum coverage.
So what exactly does the grenade contain? It contains 6oz of military grade OC/CS in a 1%/1% solution That will deliver a fog to incapacitate a large crowd!
The 6oz. units disperses in 28-30 seconds and covers an area approximately 23,000 cubic feet in 60 seconds.
$14.95
http://www.keepshooting.com/selfdefense/teargas/clear_out_teargas6oz.htm