Type-51 plasma repeater
From Halopedia, the Halo wiki
The Type-51 Directed Energy Rifle/Improved (T51 DER/I), more commonly known as the plasma repeater, is a plasma-based directed energy weapon used by the Covenant, issued to Sangheili as well as Jiralhanae shock troops.
The weapon's rate of fire will slow as it is fired and the weapon heats up. This can be solved by manually venting the rifle with the reload button, which can be done all at once or gradually. However, as the weapon overheats and the rate of fire slows, the accuracy of the weapon will decrease due to reticule bloom.
It is very likely that the Type-51 DER/I is either new to the Covenant arsenal or its use is limited to specific branches of the Covenant military, as it has only been encountered by the UNSC very recently and only in very limited numbers. Among its few battlefield uses was the Fall of Reach in mid-2552, in which it was used by both Sangheili and Jiralhanae. After the war, the plasma repeater was also used by Merg Vol's Covenant during the Battle of Draetheus V. In 2557, the plasma repeater was utilized by Jul 'Mdama's Covenant during the battles of Installation 03 and New Phoenix.
Differences from the plasma rifle
List of appearances