Skip to main content
Made by Ruger and externally looks similar to a Mini-14, but is quite different internally. Came in two basic configurations: 13" folding stock model and the full stock with 18" barrel.

There is a switch on the rear of the receiver that permits the gun to be fired either: semi-auto; full-auto; or three round burst. AC stands for Automatic Carbine and "556" represents the caliber of the round it fires. 5.56mm. The 5.56 round is a military cartridge, loaded hotter than .223 and has slightly different dimensions than .223. You can fire either 5.56 or .223 out of the AC556, although it's designed to cycle with 5.56.

The US military has never adopted the AC556. Bermuda is rumored to be the only military that has purchased AC556's for military purposes. Police departments and prisons have made major purchases of the AC556 in the past, but have switched to the M16 as it has become more mainstream and reliable.

Depending on where they live, US civillians can purcase and own the AC556. It requires that the buyer make application on a BATFE Form 4, undergo an FBI background check and obtain a CLEO sign-off before the machinegun can be transfered to the buyer. A Class III firearms dealer must facilitate the transfer. A $200 transfer tax, must be paid and tax stamp issued to the buyer by the Treasury for the machinegun to be registered to a new owner. There is no "license" for owning a machinegun. Only someone who already has a Federal Firearms License (gun dealer) can apply for and receive a Class III license (let them deal in machineguns and other NFA items)
It took me 2 months to get my CLEO to sign off on my Form 4, and once he did that it took BATFE 3 months to approve my application for transfer. Then I went down to my Class III dealer and picked up the AC556 I paid for 6 months ago.
AC556 by Ricardovitz September 19, 2009
AC556 mug front
Get the AC556 mug.
See more merch
The select fire version of the Ruger Mini-14 carbine. The 556 represents the caliber of the round it fires. 5.56mm also known as the .223. The AC in the name stands for automatic carbine,(AC556) The rifle has a selector switch on the receiver to select from fully automatic, three shot burst, or semi automatic. These rifles are sold strictly to Military and law enforcement, or an individual who can obtain a Class III firearms license.
The AC556 is a fine firearm.
AC556 by Freakshow 1975 November 14, 2007
Related Words
It is said of the situation where a person has the bad luck to make contact with his testicles against an undefined surface or object, intentioned or not.
Given the nature of the word, it is more appropriate to design cases where the interaction is made with a moving object, for example, a ball.
Although it is extremely painful for the victim, it tends to be considerably funny to people who witness it.
Today in the baseball game the pitcher took a nutshot; the baseball hit him in the nuts.

Man, I just watched the funniest nutshot video ever.
Nutshot by Uberflaven March 1, 2009
Word of the Day on June 26, 2026

Nerd neck 

A "human" that spends so much time playing video games that their posture is level nerd neck. Everytime anyone goes tryhard they hunch down and their neck gets longer there fore a nerd neck is always hunched down cause they're always going try hard. In other words a nerd neck is a try hard, since their neck is 100% longer than the average human being due to playing too many video games and taking them serious, nerd necks are not even considered human anymore but something more sad. Nerd necks are often found on fortnite, their natural habitat usually being tilted towers.
What a fucking nerd neck!

He is building so fast, nerd neck!

Looser more like a nerd neck ha!
Nerd neck by D Sandwich Maker February 5, 2019
Word of the Day on June 25, 2026

love peace and chicken grease 

"another of sayin peace out or good bye"
Talk to ya later......Love, Peace, and Chicken Grease
Word of the Day on June 24, 2026
slip of the tongue perhaps,
Those idiots who drive around in a ridiculously raised pick up truck, making a top heavy vehicle even more top heavy and unstable
A:*gah*
B: "Whats the matter"
A: This dam prickup is blinding me.
B: Stupid thing's, as if there lights weren't blinding enough as it is.
prickup by lunasea September 28, 2009
Word of the Day on June 23, 2026

Serial Monogamist 

Someone who jumps from one relationship immediately into another one.

Serial monogamists can not stand to be alone and often suffer from vast commitment and insecurity issues.

Because they jump into relationships immediately after the previous one has ended, serial monogamists typically don't take the time to reflect on their behavior or why their previous relationships failed; thus, they end up making the same relationship mistakes over and over again.
Person 1: Damn, Dustin already has a new girlfriend?! It's only been two weeks since he broke up with his fiance! I think he's a sociopath.

Person 2: No, he's a serial monogamist...
Word of the Day on June 22, 2026