There is a video in the related links.
An Airsoft Cannon? You mean Gun? At your age maybe. You get used to it. Also, It depends on the Joules of the BBs.
mortar, howitzer
No, it is a bombard or siege cannon.
Heavy artillery. Howitzer, mortar
Why would you want to? That sounds lame.
A mortar. Actually, it's a Howitzer. Mortars are not a form of cannon.
if you mean a rifle mounted grenade launcher (like a M203) they are sorta useful it really depends on the situation
In portable cannon, possibly the Parrot rifled cannon. In cannon mounted in fixed positions, such as forts, possibly the Dahlgren cannons. There was also a very large bore mortar known as the Dictator that fired a 13 inch shell.
yes
To build a rock wall using mortar, start by laying a solid foundation and then applying mortar to the rocks as you stack them. Make sure to use the right type of mortar for the rocks you are using and follow proper techniques for bonding the rocks together. Allow the mortar to dry and cure properly before adding more layers of rocks.
Some brick and mortar stores which sell airsoft guns include Sports Authority and Dicks Sporting Goods. Local hobby stores sell them also. If you prefer, you can also purchase them at sportsauthority's website.
brick an mortar