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There's plenty of weapons in GRA and they can be categorized like this: Melee Weapons, handguns, shotguns, rifles, and heavy weapons.
Melee weapons can inflict relatively good damages with the appropriate character build. They are very cheap and don't use ammunition.
Hand guns are cheap medium range weapons. Ammunition are easy to find. Desert Eagles have good damage, 9mm high accuracy, and Glocks have access to burst shot mode.
High damage, short range weapons. The sawed-off version can fire its two bullets at the same time for maximum damage, however its accuracy is very low. The pump action shotgun is a bit more accurate and has more ammo in the chamber but they can't use burst shot.
SMG are good medium damage and range weapons with a burst shot ability. Automated Rifles (AK-74,…) are much more expensive versions with high damage and accuracy ratings. Sniper Rifles are accurate, long range and high damage variants. They don't have access to burst shot, though.
[Not implemented properly yet]