What is the Caliber of an AR-15? Answer: 5.56: The problem with this is I'm not sure what this means exactly.

Why? Because I thought the caliber was somewhere between a .27 magnum and a .30 magnum bullet. So, it's only about a little bigger around than a .22 shell (at least this was what was used in Viet Nam. So, unless they have changed the caliber since Viet Nam War then I just don't get it. When you say magnum it simply means the bullet is usually longer than normal with more gunpowder and more propellant in it to cause the projectile to go further and faster and sometime longer distances. 

For example, a 30 odd 6 bullet is very long and designed to go through 10 men before stopping and was the main bolt action rifle used by American soldiers in World war I. It also can stop almost any engine by piercing through the block of almost any gasoline or diesel engine. 

Likewise, I'm not sure an AR-15 could pierce and engine block but it is designed to cause people to immediately bleed to death even if only their arms or legs have been hit. It goes in small and comes out taking about a 4 to 5 inch patch of flesh with it wherever it hits. That's why so many children quickly bled to death in Uvalde, Texas so quickly. They all just bled out quickly and were gone. Most people might not realize this unless they were familiar with this weapon. So, maybe it was a blessing they didn't last long in some ways and were spared long lasting pain. They might have just gone into shock and passed out and that was it and felt no pain at all physically.

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5.56 / .

The 5.56 is the original decade standard for the AR-15 caliber. This round is very light, and considering that the AR-15 holds 30 rounds, the AR-15 can carry a couple hundred 5.56 with no problem at all.May 13, 2022

What Determines the Caliber of an AR-15? | Gun Reviews

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I found what I was looking for. Here it is. it says the designation is .223 and also 5.56. So, the original round for an AR-15 was .223 which is a little larger around but much longer than a .22 long rifle shell.

1.    5.56 / .223

The 5.56 is the original decade standard for the AR-15 caliber. This round is very light, and considering that the AR-15 holds 30 rounds, the AR-15 can carry a couple hundred 5.56 with no problem at all. 

The .223 is less common but can be used interchangeably with the 5.56; however, the 5.56 does provide a little more power.

The 5.56 / .223 are excellent for using the AR-15 for tactical, home defense, and hunting purposes. This caliber choice is ideal for those living in apartments due to its low barrier penetration.

I think what they are trying to say in the last sentence is that if you shot a 5.56 in apartments it would travel through many walls.

My father told me a story of his father buying a German Luger 9mm pistol when my father was about 12 years old which would be 1928. He and his brothers found the gun and loaded it while his father was at work in Seattle, Washington and shot it into a dense forest. They didn't expect it to go through the forest as boys but it did. Luckily, the lady was playing the piano and it went through her whole house from the backyard and through the wall above where she was playing piano and lodged in the wood above the front door. When the boys found this had happened and realized it was their mistake they never spoke of it publicly ever until 20 to 30 years later or more and never told their father about this incident. Luckily, no one died in this boyish prank.

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