These weapons mods improve or increase a weapon's stability, accuracy, magazine rounds, and damage output. Submachine Guns, sometimes shortened to SMGs, tend to be a weapon of choice for classes that use biotic or tech powers, as they are naturally lightweight and effective in situations where characters are not primarily shooting. In Mass Effect 3, all weapons have mods that can be purchased or found during missions.

Mass Effect: Legendary Edition removes class restrictions on weapons, meaning players will have access to more loadout options than ever before. If Shepard is to defeat the Reapers in Mass Effect 3, they will need to make sure to upgrade weapons for themselves and their squad.