This model is a colt navy pepperbox pistol functional replica,it will be a little different from the real item in terms of details.
You may need to procure some screws before assembling.
Prepare your sandpaper and file before assembling, it will need some sanding to move and function.
As for the assembly video, sorry I don't have it. :-)
But don't worry, there are many videos on YouTube to refer to.