Magazine

Noun (măg′ə-zēn′, măg′ə-zēn′)

A holder for cartridges to be fed into the chamber of a firearm. Usually, but not always, detachable in handguns. (Cf. CLIP) , A compartment in some types of firearms, often a small detachable box, in which cartridges are held to be fed into the firing chamber.

Pistol MagazinePistol MagazineRifle MagazinesRifle Magazines

Magazine Safety

[¦mag·ə¦zēn ′sāf·tē]

Also called a "magazine disconnector." A device that prevents a pistol from being discharged when the magazine is removed. A mechanism for an automatic pistol, to make firing impossible unless the weapon contains the magazine.  A magazine disconnect is an internal mechanism that engages a mechanical safety such as a block or trigger disconnect when the firearm's magazine is removed  (Warning: These devices are not always reliable.)

Magazine disconnect
Magazine disconnect

Mainspring

Noun  (mān′sprĭng′) or (ˈmeɪnˌsprɪŋ)

The spring that powers a handgun's firing mechanism. The mainspring is that spring on (or in) a gun which does the job of causing the gun to fire. That is, while other springs are often used and are also integral, the mainspring is truly the main spring in that it performs the most important function.

The mainspring is the spring which causes a gun's hammer and/or firing pinto fall and/or travel forward under spring-exerted pressure.

On guns which lack a hammer, such as striker-fired pistols and bolt action rifles, the spring which drives the firing pin is often simply called the firing pin spring, which is correct - but it can also be correctly called the mainspring.

Revolver MainspringRevolver MainspringPistol MainspringPistol Mainspring