CQB is a type of fighting in which teams engage each other with personal weapons at close range. Personal weapons in this case are submachine guns like the MP5 and pistols or even shotguns. Usually the submachine guns are AEGs (Electric airsoft guns), the Pistols are either spring or gas guns.

If you would notice the weapons used in this scenario are short because enemies, hostages and teammates are closely intermingled. This is due to the fact that CQBs are usually played in buildings and houses where there is a defending and an attacking team.