It actually a type of ammunition. Instead of the firing pin smacking the center of the igniter cap, the rimfire ammunition is hit at the base. It is basically a wider percussion cap so you can not shoot high caliber bullets from them and they are only a one time use.
stingers are Airsoft guns
Slug guns have a fully rifled barrel like a center fire rifle. This helps improve accuracy. A regular shotgun barrel is smooth bore with different choke tubes for a specific desired shot pattern.
Yes.
The diameter of the projectile.
the suppressor
Fire Your Guns was created in 1990.
The Dahlgren guns were considered an improvement of the Paixhans, which could only fire shells (explosive projectiles) where the Dahlgren could fire shell, solid shot, and canister (lead ball anti-personnel) The Dahlgren guns had a characteristic shape, and SOME were rifled and SOME were larger than the Paixhans guns. Wikipedia has a good brief article on the Dahlgren guns, as well as Paixhans.
It's between 20 and 30 km
Maker and price
Well, spring airsoft guns use an internal spring to fire the ammo and by auto you could be referring to either Auto Electric Guns (AEG's) which are quite popular and my personal favorite. AEG's use a rechargeable battery to operate a motor which fires the ammo that way. Have fun.
Fire All Your Guns at Once was created in 1996.
New guns have a better fire rate and have more attachments you can say. Old guns had horrible reloading and a lack of ammunition. New guns have enough and a good amount of ammunition.