Definitions by Anonymous
AK-47
The world's absolute most proliferous assault rifle, with more than 90 million units currently existing. Commonly seen as a terrorist weapon, and for good reason, as it is relatively inexpensive, and very robust, able to brave extreme weather conditions. Chambered for the Russian 7.62 x 39 mm rifle cartridge.
glock
Contrary to popular belief, the Glock is not just the preferred gun of gangsters and other criminals, but also the preferred gun of 40% of the US's law enforcement agencies, as well as that of several government agencies. This is because it is an inexpensive, lightweight, and overall very reliable handgun. The newest Glock, the G37, is chambered to fire a new custom .45 GAP (Glock Auto Pistol) cartridge, which is nothing more than a necked down .45 ACP round.
CAR15
A "commando" weapon, as well as a personal defense weapon platform, the CAR-15 was designed to be a compact package with high firepower to be issued to troops whose primary duties were not front-line combat. Commando's also chose the CAR-15 due to its compact size. It met with little success however, as several faults such as excessive muzzle flash and reduced accuracy dropped its overall effectiveness.
bolt
The assembly on most SMG and larger-class firearms that is responsible for the chambering of a new round, as well as the extraction of the spent casing. It is usually mounted on one or more spring-loaded guide rods, and is operated by a number of ways. From using the recoil force of the exploding powder charge to being manually pulled backwards and then forwards to battery again, it is an essential part of any automatic firearm.