Gun sounds is best to simulate realistic gun sounds.
Download this app for free.
This app is very easy to use you only have press fire button it will show you real simulation of gun fire sound.

This guns simulator is the most realistic simulation shots of weapons. This weapons simulator is a large collection shots sounds from different types of weapons. This application contains almost one hundred different types of weapons, such as machine guns, machine guns, grenades, pistols, revolvers, as well as sniper rifles and shotguns. This collection of sounds of shots guns will suit everyone who is interested of differences weapons types.
So if you want to play war with your friends or just want to scare someone, then this collection of gun sounds for you!