Airsoft Artillery/howitzer(s)
 

would like to know what people would think of having mocked up versions of the real things launching 4 inch nerf foam balls and such. would that interest enough people that it could start being produced and sold at a retailer near you?

We used to have mortars that shot BBs encased in styrofoam cups. Or 2" nerf rockets.
Can build it for about $120 or so, got 600+ft of range

Airsoft/paintball howitzer.
http://youtu.be/3yc3fAC5vOI
A company makes a mortar rocket thing as well

^^^^ hahaha thats awesome