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The M-4 Shuriken is the default sub machine gun in Mass Effect 2. Despite being a burst gun, it is not very accurate; it also has a low damage output. For these reasons it is advised to pick up the M-12 Locust
early in the game if you have the DLC.
The M-4 Shuriken has a 240 rounds, and 24 rounds per clip. Through player driven tests, It has been determined that it has a a base DPS of 89 damage per second. According to an official post
on the Bioware forums, it does 1.5 extra damage to shields and barriers. This makes it an effective weapon against enemies with shields (such as Geth) or barriers (such as Collectors).