The mode is effective against human targets, as the damage output is considerably higher than that of standard unarmed attacks, but the mode deals little damage against the Skedar themselves, as they are extremely resilient to melee attacks. The Reaper's secondary mode, Grinder, causes the gun's barrels to spin up as if they were firing normally, with the attached barrel blades dealing significant damage to targets within melee range.
Despite this, the gun's ludicrous fire rate is more than capable of laying down a field of suppressive fire, and is highly effective against groups of unshielded targets. Crouching while firing helps increase the gun's accuracy, but considering that the bullets fired have the same damage profile as the CMP-150, the Reaper is outclassed by every other automatic weapon in the game (except the KL01313).
That being said, the Reaper's greatest flaw is it's horrid accuracy (lower than that of the AR34 or Cyclone in it's secondary mode), as the incredibly wide bullet spread means that you are more likely to hit everything else besides your target in a typical combat scenario.
Firing at 1800 rounds per minute while at full speed, the Reaper has the highest rate of fire out of any gun in Perfect Dark (even more than the Callisto NTG or RC-P120). In the gun's standard firing mode, the Reaper acts in a similar manner to a conventional Gatling gun, firing rounds automatically at a gradually increasing rate. The Reaper is a large automatic weapon found in Perfect Dark, used by the Skedar.