They use their own category of ammo called Power Cells, which is harder to come across in the game, so make sure to use your heavy weapons only when you need to. Generally used only for special situations, heavy weapons can have a variety of effects. It is found during Tali’s loyalty quest on Hardcore difficulty.

This makes it particularly effective against boss opponents, who are often shielded in some way. Geth Pulse Rifle: Very effective at most ranges, the Pulse Rifle is strong against shielded enemies. It isn’t very accurate, however, so long range combat is out of the question. It is among the most deadly weapons at short to medium range and a really good pick for Soldiers. M-76 Revenant: Only available to Soldiers as advanced weapons training, the Revenant has an extreme rate of fire. It is found during the Archangel recruitment mission just after reaching Archangel. It lacks full auto so isn’t as good at short range encounters.

M-15 Vindicator: A very accurate rifle good for mid to long range combat which fires in 5-round bursts. It is however surpassed by later upgrades, which are more precise or more brutal depending on your needs. Fully automatic and decent against anything.

Mass effect 2 weapon training