In firearms terminology, the firearm receiver or firearm frame is the part of a firearm which provides housing for internal components such as the hammer, bolt or breechblock, action and firing mechanism, and is usually threaded at its forward portion to "receive" the barrel and has screw holes on the bottom and/or rear to receive the stock and grip.

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Caliber is used to describe the size of a rifle or handgun bore and the size of cartridges designed for different bores.

A gun barrel is a crucial part of gun-type ranged weapons. It is the straight shooting tube, usually made of rigid high-strength metal, through which a contained rapid expansion of high-pressure gas(es) is introduced (via propellant combustion or mechanical compression) behind a projectile in order to propel it out of the front end (muzzle) at a high velocity. The hollow interior of the barrel is called the bore.

Think of scope mounts as the lug nuts of the shooting world. The bases and rings used to connect a riflescope to a firearm are often the weakest link in a shooting system. Without a properly fitted connection, the very best scope and rifle combination is rendered useless.

A muzzle brake or recoil compensator is a device connected to the muzzle of a firearm or cannon that redirects propellant gases to counter recoil and unwanted muzzle rise. ... They have been used in various forms for rifles and pistols to help control recoil and the rising of the barrel that normally occurs after firing.

The term “trigger” is often used to refer to both the entire system that releases the firing pin (the trigger mechanism) as well as the individual part of that mechanism that is directly pulled by the finger.