This cleaning kit keeps a Ranger's weapon in peak condition, reducing weapon jams by 25%. It can be very useful to maximize the fire rate for weapons that either have a high rate of fire or a high chance to jam, or both. Due to its minimal bulk capacity, it is an excellent option for Rangers with a free equipment slot as it is extremely lightweight and offers a significant bonus to assault capability.
U.S. infantrymen in Vietnam were given standard-issue collapsible, lightweight cleaning kits that could fit into the trapdoor compartment of their M16 rifles, due to the higher than average jam chance and maintenance requirement of the rifles, particularly in Vietnam's humid jungle conditions. These kits typically consisted of a number of brushes and picks to remove hardened grit and dirt, as well as an oil or other cleaning solvent.
The need for periodic weapon maintenance on the M16 is considered one of the main causes of the U.S. failure in the Vietnam war, combined with the commonality of jams and malfunctions when compared to the incredibly reliable AK47 commonplace among NVA and VC forces.