Yes. If screws are too loose then air can leak, and overtightening may strip screws.
get a bore attachment to a screw gun or drill.
No
A screw gun is just for screws. You can't put a drill bit in it. It also usually will not engage until you push in on the screw.
In North America, if the screw gun plugs into a wall receptacle the voltage will be 120 volts. If it is a battery operated screw gun the voltage will be marked on the battery that operates the device.
Gun shops, parts catalog.
The tank is probably empty, your safety is on, or you have not cocked the gun.
A drywall screw gun can be purchased at many hardware stores such as Home Depot, ACE, or Lowes. They can also be purchased online in places such as Amazon.
Drywall screw guns are designed specifically for drywall applications whereas cordless drills are multipurpose. The screw gun will disengage from the screw when it reaches the proper depth for the screw,a cordless drill relies on the operator to know the proper depth.
The most common usage for a screw gun is to replace a screwdriver. The screw gun is a very convenient tool that makes projects with a lot of screws faster to complete.
Go to a gun shop
you screw the adapter into the gun, and then the co2 cartridge.
To countersink is to penetrate past the exterior level. For example if you screw a screw into a piece of wood with a screw gun that is set on drill, and it penetrates past the surface it would be countersunk.