Finesse. When making an attack with a finesse weapon, you use your choice of your Strength or Dexterity modifier for the attack and damage rolls. You must use the same modifier for both rolls. 

Heavy. Creatures with less than 10 strength have disadvantage on attack rolls with heavy weapons. A heavy weapon’s size and bulk make it too large for a weak creature to use effectively. 

Light. A light weapon is small and easy to handle, making it ideal for use when fighting with two weapons. If you are wielding a weapon with the light property, you may wield another weapon with the light property in your offhand. When you take the attack action and attack with the light weapon in your main hand, you can attack with the light weapon in your offhand as a bonus action

Loading. Because of the time required to load this weapon, you can fire only one piece of ammunition from it when you use an action, bonus action, or reaction to fire it, regardless of the number of attacks you can normally make. 

Range. A weapon that can be used to make a ranged attack has a range shown, listed by two numbers. The first is the weapon’s normal range in feet, and the second indicates the weapon’s long range in feet. When attacking a target beyond normal range, you have disadvantage on the attack roll. You can’t attack a target beyond the weapon’s long range.

Reach. This weapon adds a number of feet to your reach when you attack with it, as listed by the number in the table.

Two-Handed. This weapon requires two hands to use, meaning that you do not have any free hands while this weapon is drawn.

Versatile. This weapon can be used with one or two hands. A damage value in parentheses appears with the property—the damage when the weapon is used with two hands to make a melee attack.

Special. Due to the special nature of this weapon, you have disadvantage to hit targets that are within 5 feet of you.

Thrown. If a weapon has the thrown property, you can throw the weapon to make a ranged attack, and you can draw the weapon as part of the attack. You use the same ability modifier for the attack and damage roll of the weapon that you would use for a melee attack with the weapon. The range of the thrown weapon is listed by two numbers. The first is the weapons normal range in feet, and the second indicates the weapon's long range in feet. When attacking a target beyond normal range, you have disadvantage on the attack roll. You can’t attack a target beyond the weapon’s long range.

Firearm. A weapon with the firearm property is loud when you make an attack with it.

Reload. The weapon can be fired a number of times equal to its Reload score before you must spend an action to reload. If you have the extra attack feature, you can replace one of your attacks to reload. You must have one free hand to reload a firearm.

Misfire. Whenever you make an attack roll with a weapon that has a misfire score and the number rolled on the die is equal to or lower than the weapon’s misfire score, the weapon misfires. The attack misses, and the weapon cannot be used again until you spend an action to try and repair it. To repair your firearm, you must make a successful Tinker’s Tools check (DC equal to 8 + the weapon's misfire score). If your check fails, the weapon is broken and must be mended out of combat at a quarter of the cost of the firearm.