Rifle 52, formerly known as Rifle 51, is a select-fire weapon usually used by guards and researchers in Runker 51 which can be obtained through Armory, or can also be purchased through the shop. It can also be obtained by going into the runker warehouse and jumping on the boxes.
Rifle 52 has pretty good damage, fire rate and accuracy. This weapon is quite useful to be prepared from enemy attacks. It resebles a black G36C ("C" for compact).
It is guard's default equipment from Guard's buff update.