You’ve just acquired an AR15 and are curious to know what it does. You’re in luck. We’re peeling back the layers to help you understand the bits and bobs that make up this iconic firearm. Read more now on ar15parts.com/

Let’s be clear: this isn’t rocket-science, but it may feel like a puzzle to a newbie. Once you become familiar with AR15 Parts it will be just like playing your favorite videogame.

The Upper Receiver: The Brain Box

Start with the upper receiver. Consider the upper receiver as your rifle’s brain. This is where the action happens–literally. It houses the barrel, bolt carrier group (BCG), and charging handle. The barrel is the long tube where bullets exit. The BCG? The engine is like that. The charging handle is it? It’s similar to the way you start a lawnmower by pulling a string.

The Lower Receiver: the Heart of the Matter

Now, let’s chat about the lower receiver. It’s not as glamorous, but this is the heart of your AR15. This is where the magazine well, trigger and buttstock are located. The trigger is the direct link to action. Pop in a fresh mag in the magazine well, and you’re good to go. Buttstock? The gun is resting on the shoulder.

Handguard and Rail Systems: The Swiss Army Knife

Ever heard of a handguard? If not, think of it as a super versatile Swiss Army knife attached to your barrel. It protects your hands from the barrel’s heat and offers you a spot to mount accessories. Picatinny, M-Lok, or KeyMod rails? These are all terms used to describe different mounting systems that can be used for lasers, lights, grips, etc.

Gas System: The Middleman

Gas is also used in your rifle to fire the bullet. When you fire, gases push the bullet out of the barrel, but they’re also redirected to cycle the BCG. This is like killing two birds at once: the bullet moves and the gun is ready for the next shot.

We’re not talking about ultra-obsessive routines here, but it is important to keep your AR15 clean. A dirty rifle is like trying to drive a car with mud all over the windshield–not ideal. It will treat you well if it is kept lubricated and free from gunk.