The world of guns is complicated not only because the guns themselves are complex machines but also because of terminology misuses and resulting in misinformation that might get you into problems.
Since you’ve got here, you want to know the difference between a carbine and a rifle because sometimes they are indistinguishable.
Actually, the difference is hard to explain in a few words.
Our gun store has done an in-depth investigation and is now reporting the results.
Besides tackling the rifle vs. carbine topic, we touch upon short-barrel rifles, AR-pistols, and 9mm carbines for the sake of a bigger picture.
What is a Carbine Rifle
To understand the difference between a rifle and a carbine, we need to go back to the time when the term carbine first appeared.
At the end of the Middle Ages, the accessibility of firearms led to the transformation of cavalry from cold-armed knights to cavalry using firearms.
However, you can easily imagine that maneuvering and shooting a full-size long-barrel firearm while riding a horse wasn’t an easy task.
That’s why European gunsmiths started manufacturing long guns with shortened barrels specifically for cavalry. And those were called carabines.
During the 17-19 centuries, carbines were an independent type of firearm.
However, from the second half of the 19th century, long-barrel guns became more complex and, thus, more expensive. So, making shorter versions of rifles was more cost-effective.
That explains why many of today’s gun users intuitively describe carbines as shorter versions of rifles.
But how short should a barrel be? At what point a rifle becomes a carbine?
Legal Definition of Carbines
Well, there is no legal definition of a carbine. Instead, we have definitions of firearms regulated under the NFA.
According to it, a rifle is a weapon intended to be fired from a shoulder (in other words, it has a shoulder stock), while a short-barreled rifle is a rifle with a barrel of less than 16 inches and an overall length of less than 26 inches.
To legally own an SBR, you should register it with the ATF and pay a $200 NFA tax stamp.
So, is a short-barreled rifle automatically a carbine, a shortened version of a rifle? No, not always.
The general, unofficial consensus on carbines is that these are semi-auto rifles with a barrel under 20 inches. They also tend to fire the same ammunition as their longer-barreled counterparts.
Let’s now consider some examples for more clarity on the subject.
Carbines vs. Rifles
Let’s talk about our beloved AR platform. The ArmaLite AR-10 was developed first and was chambered for the 7.62x51mm NATO with a barrel length of 20.8 inches.
However, the rifle wasn’t maneuverable enough, and the ammo was too heavy to carry in sufficient amounts.
For that reason, the AR-15 in the lighter .223 Remington was introduced. After several years, it was adopted by the military as the M16 rifle and the 5.56x45mm NATO cartridge.
ArmaLite’s original AR-15 had a shorter 20-inch barrel, which gives us reason to call the AR-15 a carbine. Most modern AR-15 rifles feature an even shorter barrel of 16-17 inches long.
Then, we have the M4 carbine, a stripped-down version of the M16/AR-15, developed for CQB situations.
The military M4 is designed to fire the same 5.56 NATO from a barrel of 14.5 inches long. However, to comply with the NFA requirements, civilian M4 have barrels of 16 inches.
Another AR-15 descendant is the Daniel Defense MK18 based on the Close Quarter Battle (upper) Receiver for the M4.
The MK18 is not a rifle but an AR pistol with a 10.3-inch barrel. Yeah, it looks nothing like a pistol we usually imagine. Let us explain.
Remember the NFA? To escape its regulations with application forms, taxes, and other fun stuff, manufacturers started making AR-15s with no stock.
They either had prominent buffer tubes or pistol braces that shooters were prohibited to shoulder. A weapon with a pistol brace instead of a stock and no vertical foregrip qualifies as a pistol.
As you see, whether a rifle is considered a carbine depends on the context. We can say the AR-10 is a rifle, and the AR-15 is a carbine, a shortened version of the AR-10.
We can also refer to the AR-15 as a rifle and consider its counterparts with a <16-inch barrel carbines.
Pistol Caliber Carbines
While carbines, in general, are a vague category of firearms, pistol caliber carbines (PCC) are far easier to define.
A PCC is a short-barreled rifle that fires pistol rounds. Actually, retailers often use the term carbine to refer only to PCC.
Before we talk about why you should consider buying a PCC, let’s talk about pistol caliber carbine ballistics.
Compared to rifles, carbines have a shorter barrel, as we’ve learned, and the length of the barrel directly impacts bullet velocity.
Reduced velocity means shorter effective range, a bit reduced accuracy, and less power on impact.
However, compared to pistols, PCCs are more powerful because the bullet has more time to accumulate energy.
So, pistol caliber carbines in 9mm, .45 ACP, or .40 S&W are ideal for close-quarter home defense situations because they are more maneuverable than rifles and more powerful than pistols.
Besides, the recoil in PCC is softer thanks to the mass of a heavier gun absorbing more of it.
It leads to less recovery time and more confidence.
Compared to 16-inch rifles that fire rifle rounds such as the .223 Rem and .308 Win, the muzzle blast and report in carbines chambered for pistol cartridges are also reduced. Besides, with a PCC, overpenetration is far less likely to happen.
Some people wonder if they can hunt with a 9mm carbine.
Well, the effective range of a 9mm carbine is around 100 yards, and the muzzle velocity of a 9mm 115gr JHP+P bullet fired from a 16-inch barrel is about 1,520 fps, which is a good start.
To kill a deer humanely using a 9mm carbine, you need to be very close to it, use powerful hollow point ammo, and place the bullet where it belongs.
It’s far from the best hunting weapon, but it can kill if the conditions are right. However, there is a centerfire cartridge more suitable for this task, the 10mm.
Anyway, do your homework and check local regulations before shooting animals with a PCC.
Final Words
Let’s sum up. Generally, carbines are rifles with shorter barrels.
However, in most cases, when people say carbine they mean a pistol caliber carbine, e.g. a short-barreled rifle that fires pistol rounds like the 9mm Luger or the .45 ACP.
We hope now you won’t have a problem with understanding what is considered a rifle, a carbine, or an AR pistol.