Given the right set of circumstances, yes.
No, you will not be allowed.
Better is a very general team, and you need to have specific models in mind to compare any.
Yes the ray gun is lethal, the ray gun is one of the most powerful guns in nazi zombies
The AK-47 is the most lethal gun because you can learn how to use it in one hour or less. It is also the most produced weapon in the world.
A Ray Gun is commonly mistaken for its real life counterpart, the Water Gun. A Water Gun can be an extremely lethal weapon when in your command. Though it is lethal, there have been many misuses of the gun due to reckless children.
9mm beretta
Any gun is capable of being lethal. If you wanted a "most lethal", maybe the 155mm howitzer, which is capable of launching tactical battlefield nuclear nuke.
out? probably 2% with goggles 0%
it shoots a lot of bullets in a short time
Gun stores which also cater to non-lethal/less lethal defence needs will typically carry them, and you might find them at military surplus stores and the like. You can also order them online.
The question is a bit moot. All guns are capable of being lethal.
Nerf Blasters are not lethal. They are not weapons and are toys instead.