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AR 15 is the civilian version of the military's M4 carbine. Contrary to what most people believe AR doesn't stand for assault rifle, rather it stands for the original manufacturer Armalite Rifle. AR 15 is semiautomatic and does't meet Federal requirements to be classified as an assault rifle.
AR 15 is so legal in Kalifornia, now everyone is sporting it
by Nasor6221 July 13, 2015
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The gun that gets a real bad rep because it is used in almost every mass shooting. Although in reality it is used because it is very common and plentiful in America. The fake news media typically portrays the AR-15 as the "Most deadliest gun ever made" or that it is a "Weapon of War" although in actuality it is a civilian version of the M4A1 that is the REAL weapon of war.
The media acts as if the AR-15 is the only gun in existence.
via giphy
by A Human Male July 21, 2018
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This gun SJWs claim is the spawn of all evil. Believe it or not, the AR actually is the Father of the M16, and the M16 was developed off it. It is now marketed as a Semi-Auto Rifle for civillians in America. Recently, there has been a Libtarded movement to ban it, following the recent school shootings.
Visitor: Oh, is that your M16?
Gun owner: No, it's an AR 15 man. Have you been playing too much COD recently?
by Nein_Definition July 14, 2018
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The AR-15 is the semiautomatic version of the M16 series of assault rifles, designed by the great designer Eugene Stoner, and it is most commonly used by the US armed forces. I would get into the history of this gun, but it is very longwinded but thoroughly interesting. AR-15s are usually chambered in 5.56 x 45mm (.223 Remington) caliber and have either 24", 20", 16", or 11.5" barrels and have either collapsible stocks or full stocks and may either have a NATO railed flattop or a carrt handle with an adjustable rear sight. This weapon has been the basis of numerous high-accuracy rifles.
I am so getting an AR-15 when I get my license.
by Ian R May 14, 2005
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A scary gun that scares everyone. It is a military grade, will-kill-everyone, nuclear grade weapon. Do not ever look at someone who has an AR-15 because they will murder you.

(Your experience may differ, you may or not be murdered and when you purchase an AR-15 it may or may not be nuclear grade.)
"Oh my god! That school shooter has a military grade AR-15!" - Responsible, totally factual sjw
"No he doesn't. The AR-15 is not military grade, it is civilian." - Mean, despicable, totally not factual person
by Clonie May 26, 2018
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The AR-15 is a common assualt rifle. Very similar in looks to an M-16, but not exactly.

AR does NOT stand for Assault Rifle, as is commonly believed. AR stands for the original company that manufactured it, ArmaLite. ArmaLite sold their rights to the AR-10 and AR-15 designs in 1959 to Colt.

With a simple barrel and receiver switch, this rifle can fire 14 different calibers and sizes of ammunition, ranging from .22LR to .50BMG.

Completely customizable, this rifle can also be a personal defense firearm at less than 36 inches long, to a sniper rifle over 50 inches.

Standard magazine (or clip, if you prefer) is 30 rounds, but aftermarket 5, 10, 20, 30, 40, 60, 90, and 100 round magazines are available as well, but only the 5 round, non-detachable clip is legal in California. These clips are breech loaded, and do NOT come off. The reason for this is because of the Assault Weapon Ban that The Clinton Administration put into affect, and this method of semi-automatic action slows the loading process and is supposed to reduce murders. All it did was boost illegal weapon sales.

With the modular accessory rail, hundreds of different aftermarket accessories are available. These range from simple, and relatively cheap in price, tac-lights, vertical secondary pistol grips,to night-sights, to bipods, to thermal scopes, to night-vision scopes and infrared scopes beyond normal mag-scopes with somewhere around 20+ compatible scopes. Other accessories are different stocks, from collapsibles to solid body, to skeleton, to adjustables.

These rifles, when sighted in are accurate up to 500 yards, with a range well beyond that.

The semi-automatic feed uses a direct gas impingement system. (If lost with this term, use wiki)

This rifle was designed by Eugene Stoner in 1958 as an updated, lighter version of the AR-10. The design was initially submitted as a new rifle for the US Armed Forces, and is what the M-16 was based off of.

Overall, this is a very effective weapon for home defense, hunting, sharpshooting, and just fun at the range.
Possible calibers for the AR-15 are:

5.56x45mm NATO
(Yes, the NATO round is different from a .223REM. The NATO round has higher power, and needs mods to the weapon to be fired safely. Commonly confused and called the same as .223REM, because they have the same physical dimensions but different power levels)
6.5 Grendel
.45 Bushmaster
.300 Whisper
9mm Parabellum
.50 Beowulf
(All these .50s are different power ratings and dimensions, but the bullet itself is the same size.)
by Brian Keeney November 09, 2006
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