It's clear that the three women in the bathroom don't know anything about guns. At the very least, everyone should know the 4 basic rules of gun safety. (a) Treat every gun as if it is loaded until you have personally inspected it to verify it is empty. (b) Keep your finger off the trigger until ready to fire. (c) Always know what is behind your target, to ensure innocent bystanders or property is not damaged. (d) Do not point the gun at anyone or anything you are not willing to destroy. Always have your gun pointed in a safe direction.
The gun Dale carries is a Beretta 92FS. At one point early in the film, Juls says "This isn't [link=tt0095016. In Die Hard (1988), Bruce Willis' character John McClane wields a Beretta 92FS as his primary sidearm.