Guns 101

OK, so what are those “mechanical attachments” that are part of a gun? Well, let’s break it down into some basic pieces:

Gun Components

In 99.9% of all cases, all guns include the following parts: muzzle, breach, hammer and trigger. These components often determine how a firearm operates and how it is classified.

Muzzle: The Business End of a Gun

Muzzle = Front. Or, more specifically, the muzzle is the opening on the front of a firearm. This is where the projectile comes out of. Click on the examples below for more detail.

The muzzle is the open end of the front of a gunMuzzle of a Pistol

The Breech

Simply, the breech is the back. With early firearms, the technology limited how guns were loaded. For centuries, guns could only be loaded through the muzzle and they were known as “muzzle-loading” guns. Later, as technology improved, guns could be loaded through the breach and were referred to as “breech-loading”. Click below to see some examples of gun breeches:

The BreachThe Breach

The Hammer

The hammer is the part of the firearm that makes contact with the bullet primer to ignite the powder and propel the bullet out of the muzzle (read more about bullet cartridges). For most handguns and some rifles, the hammer is visible on the outside of the firearm. However, for most rifles and shotguns and some pistols, the hammer is internal.

With some guns, the hammer doesn’t even contact the primer directly at all. In those cases, a firing pin is used. The firing pin is struck by the hammer driving it forward into the bullet’s primer to fire the round.

A Pistol HammerA Pistol Hammer

The Trigger

The trigger is the part of a firearm that files the round. On certain guns, like single action revolvers, the hammer has to be “cocked” – or pulled back into position – before the trigger can be pulled. In those cases, the pull of the trigger releases the hammer to fire the round. With most other guns, the trigger pull is considered double action in that pulling the trigger both cocks the hammer and releases it thereby firing the weapon..

A Pistol TriggerA Pistol Trigger

12 thoughts on “Guns 101

  1. Therese on said:

    What type of gun would be good for a woman? I have zero to no experience except firing a .9 mm at the range that has too much kick for me. Im looking for a full size gun AND one for conceal carry. Im taking a gun safety course and cc class soon.

    • A Gun Guy on said:

      Hi Therese. Someone I know just recently spoke to a female police officer about this very subject. She and many other woman I’ve spoken to often recommend a .380 caliber or what is also often referred to as a “short nine”. The .380 round is the same diameter as a 9mm but is shorter and has less powder and therefore less recoil. It is one of the most common concealed carry pistols available today. There are many different makes and models such as Beretta’s Pico ( I’d start there and see if you can rent one at a local gun range to get a feel for it yourself.

  2. ricki on said:

    First of all I want to say thank you for this website. It’s been pretty helpful in gaining more knowledge on guns & ammo! My question is, I’m looking to buy a gun for concealed use. I would prefer a revolver (I’ve tried 9mm SA a few times and didn’t care for them), but I’m not sure which would be better for me. A few guns I had in mind include the S&W bodyguard 38, .38 Special S&W or .357 S&W. I’m still new to guns (I did take a safety course, I’m just don’t know that much about the guns themself) so I’m not sure which would be better. I do understand that a .357 can use .38 and .357 ammo, but is also more powerful than a .38. Any suggestions?

    • tony on said:

      nothing wrong with a revolver i would go with 357 because one is the ammo you might find different stuff on sale next you wont see much difference in recoil and really a revolver in my opinion is more dependable just not enough ammo for me, anything is better than nothing

  3. Jim on said:

    What is a Picatinny rail?

    • A Gun Guy on said:

      Hi Jim. A Picatinny rail is a system integrated into a firearm to allow for easily adding and removing attachments like a site, or laser or flashlght, etc. Picatinny rails are either integrated into the firearm by the manufacturer or can be added to some firearms as a modification.

  4. prapunch on said:

    If someone wants to learn how to manufacture guns, what should they do?

    • A Gun Guy on said:

      Get and apprenticeship with a gunsmith

  5. gunforatonguexo on said:

    Breech** lol

  6. Mark on said:

    What does “ACP” mean in Colt 1911 .45 cal ACP?

    • A Gun Guy on said:

      ACP stands for Automatic Colt Pistol. It’s used most commonly to describe the .45 and .380 calibers used in semi-automatic handguns. The .45 ACP was invented by John Browning when he first developed the 1911 pistol as a replacement for the standard issue .38 caliber revolver carried by U.S. servicemen. Up until then, most handguns were revolvers but the 1911 was semi-auto. I believe that it was given the designation ACP to separate it from other .45 caliber rounds that were often used in rifles prior to the introduction of the 1911 pistol.

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