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Why Is the AR-15 Platform So Popular?

We take a look at the AR platform and talk about what's made this rifle, in specific, so popular and widely loved.

It’s no secret that gun people love the AR-15.

Ever since Colt redesigned this rifle for mass production, it’s been a favorite among law enforcement and civilians alike.

Springfield Saint Pistol Kit
Springfield Saint

Conservative estimates put the number of AR-15 rifles in the U.S. somewhere between 5 and 10 million. The NRA called an estimate of 11 million “lowball.”

Realistically, there are likely to be a whole lot more AR-15s out there than that. In truth, though, we don’t know exactly how many are out there.

MultiCam AR Painting
Painted Aero AR

What we do know is that the AR-15 is incredibly popular.

If you have an AR-15 of your own, or even if you’ve just shot someone else’s, you probably understand why. But if you’ve never handled one of these rifles, you may be curious about what makes AR-15s just so appealing.

Well, let’s break it down.

Table of Contents



First, the AR-15 is well-suited for an array of purposes.

For one, it’s one of the most popular competition rifles and shows up in everything from 3-Gun competitions to Precision Long Range competitions.

Competition Rifle with BSF Barrel
Competition Rifle with BSF Barrel

Many competition styles even have classes specifically for PCC AR-15s.

It’s also a popular choice for hunters, with .223 Remington a suitable cartridge for a variety of game, from small varmints to — with the right bullet — deer (though you should check to make sure .223 is legal to use for deer hunting where you live).

Wolf Gold .223 55gr
Wolf Gold .223 55gr

The self-loading aspect of the design is useful for quick follow-up shots when hunting dangerous game like feral hogs.

It’s also a good rifle for tactical purposes — both CQB and long-range situations. And it’s the civilian version of the M16, which is a popular military rifle around the world.

What I Carried M16A4 Clone (1)
M16A4 Clone

The AR-15 itself is used by both civilians and law enforcement. Civilians tend to favor it for home and property defense.

And, of course, some people just like to plink with AR-15s. The affordability of .223 and the ease of operating AR-15s makes these rifles great for recreational shooting.

Daniel Defense DDM4ISR

Modular Design

Next, the AR-15 offers a modular design, which means that individual pieces of the rifle are built to be interchangeable.

You can take one part from an AR-15 and put it in most other AR-15s. There are exceptions, sure, but interchangeability is the general rule.

Modded AR-15s
Modded AR-15s

This provides a few advantages.

For one, it makes it super easy to build your own AR-15. Build kits make it even easier, but you can also pick out each piece individually.

Similarly, there’s a huge market for professionally made custom guns, so you can get a fully personalized AR-15 without even having to do the building yourself.

Pew Pew Upgraded AR-15s
Pew Pew Upgraded AR-15s

Alternatively, you can easily customize an off-the-shelf AR-15 with the upgrades you want.

And there’s no shortage of aftermarket upgrades available for you to use to create the AR-15 you want.

It also makes it very easy to repair and maintain your AR-15 since it’s easy to track down replacement parts.

All The Charging Handles
All The Charging Handles

This modular design also has some interesting legal implications for those trying to avoid doing extra paperwork.

Only the lower has a serial number, so you can use the same lower with different uppers, and it still only counts as one firearm for legal purposes.

Aero 10.5" Upper
Aero 10.5″ Upper

Multiple uppers allow you to use different calibers, so you’re not stuck with just .223. (We’ll talk more about the advantages of that in a minute.)

Furthermore, 80% receivers allow you to build a rifle without serializing it (for now) since an 80% receiver isn’t technically a firearm.

It requires more work and knowledge than making an AR-15 from a completed lower, though.

All Done with 80% Receiver
80% Receiver

Caliber Options

We’ve already talked about ammunition a little bit, but let’s go into a bit more detail.

The standard ammo round for the AR-15 is .223 Remington, but most also tolerate the higher pressure of 5.56 NATO, a military round that is otherwise almost identical to .223.

5.56 rounds

.223 Remington is appealing in that it is very affordable, offers light recoil, and is as versatile as the AR-15 itself. 

Your caliber options don’t end with .223 and 5.56, though, and alternative calibers can expand the uses of your AR-15 beyond even what we discussed earlier.

For example, an AR-15 chambered for .458 SOCOM allows you to hunt much larger game than .223, even up to moose and bear.

.458 SOCOM (500gr)
.458 SOCOM (500gr)

.22 LR is ideal for the opposite end of the spectrum. It’s even easier to shoot than .223 and is ideal for varmint hunting, new shooters, and plinking.

5.56 (left) and .22 LR (right)

.300 BLK is perhaps the most popular alternative caliber for AR-15s. This round stands out as it’s designed for a shorter barrel and because subsonic ammo is hearing safe when combined with a suppressor.

300 BLK
300 BLK

And let’s not forget pistol caliber carbines. 9mm is the most popular for these guns, followed by .45 ACP.

CCI Blazer Brass 9mm
CCI Blazer Brass 9mm

And remember: the AR-15s modular design allows you to use those different calibers with the same gun, just by switching out the upper. Conversion kits are an easy, convenient way to use the same AR-15 with different calibers.

Easy to Use

The AR-15 platform is also just plain easy to use.

The simple design is simple to operate and, again, .223 offers very light recoil. The shape of the rifle is ergonomic and comfortable to shoot compared to other rifles, like the AK-47.

Faxon Firearms Ascent AR-15
Faxon Firearms Ascent AR-15

Many AR-15s have adjustable stocks, allowing smaller-framed shooters to set a shorter length of pull, working with their size.

And plenty of ambidextrous models and parts for left-handed shooters exist to make things easier. Companies like Stag Arms even specialize in left-handed AR-15s.

Grace running an AR-10 in .308 Win on a deer hunt at the age of twelve.
Running an AR-10 in .308 Win on a deer hunt at the age of twelve.

The design also tends to be pretty reliable (though no gun is totally failure-proof). So, you shouldn’t deal with a lot of malfunctions as long as you properly maintain your weapon.


There’s something of a cyclical relationship between popularity and accessibility in general. The more popular something grows, the more manufacturers will make it, and the more stores will sell it.

Then, that thing gets even more popular because it’s so easy to get. And that goes on and on and on.

Favorite AR-15s
Sky’s the limit

AR-15s are a textbook example of that.

Almost every rifle manufacturer out there makes some version of the AR-15 (and many make more than one). You’d be hard-pressed to find a gun store that doesn’t stock at least a few different versions.

And those different versions come at a wide range of price points, from very affordable to high-end builds, so there’s something for every budget.

Shut Up & Take My Money

And it’s not just the guns themselves that prove easy to get ahold of.

The popularity of the AR-15 platform means that there are also many companies making compatible parts and accessories at all price points.


Most of us gun people love an AR-15. Just look up #AR15 on any social media site for proof. On Instagram alone, the hashtag approaches 3 million posts.

A Couple AR-15 Optics
A Couple AR-15 Optics

Hopefully, by now, you have a better understanding of why we have so much enthusiasm for this iconic rifle. And to be honest, the fact that it’s iconic only feeds back into the AR-15’s popularity.

The AR-15 isn’t just a gun anymore; it’s a symbol for both the firearms community and the gun rights movement. And people sure love a good symbol.

Daniel Defense DDM4V7 Desert Shooting
Daniel Defense DDM4V7

Have we convinced you of the appeal of the AR-15? Let us know in the comments below. Also, see our definitive guide to the AR-15 for more info, or take a look at our list of the Best AR-15s to find an AR-15 to make your own.

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2 Leave a Reply

  • Commenter Avatar
    sound awake

    15 times better than an ak

    January 16, 2022 8:00 am
  • Commenter Avatar

    AR-15 was my first firearm in 2019. First upper was in 22LR and it’s a plinking favorite. Of course my 556 bigger boy is still fun too! Love the modular design and all of the options available to customize/personalize it. I can easily see why the AR-15 is so popular and glad to have contributed!

    January 13, 2022 5:36 pm
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