How to shoot a gun?) (Assassin's Creed: Unity)

convinced that Arno took the gun, hold down the right mouse button to aim and left click to shoot, shoots only when you release the left button.

Paxom
Yes, everything is already a skill I had to have :D

Paxom
have me does not work T. T

Started playing and came across can't shoot a musket or pistol, a musket in the hands of the press and nothing happens.