I'm not a gun nut, buutt....

left looks Russian, an AK of some kind. that foregrip is fuckin' weird. Never seen anything like it...

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The right one looks similar to the AR, but in a question like this I always suspect a trick question. :P it gives me a weird MP5 Vibe too,(which AR's tend to do to me anyway) so that's not helping. _hey look it is actually an AR15. huh...Thought you were trying to pull a fast one.

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As for what it stands for... American Rifle?

Automatic Reload? (therefore semi auto?)

uhhh...

Advanced Rifle?

those are my three guesses...annd I'm wrong, oh well... can't get them all right :P

the weapon on the right is an AR-15.

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 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.

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

And............so what?

I have probably shot it more than you have.

I shoot both long guns and side arms for sport at a local shooting range probably 2-3 times a month, pal.

And I think it should be banned for sale in the USA, except to law enforcement and military.

What else ya wanna know?