The AR 15 is a rifle, not a caliber. the .223 is a caliber. Usually the AR-15 is made in caliber .223.
15 fps (feet / second) = 10.23 mph
the square root of 223 is less than 15, so we only need to test its divisibility by 2,3,5,7,11 and 13. If you try dividing by any of these you do not get a whole number, so 223 is a prime.
Depends. What is the caliber of the AR-15 rifle? If it marked 5.56, yes. If it marked .223, no. While you MAY fire 5.56x45 ammo in a .223, they are NOT the identical cartridge, and it is not a good (or safe) practice. .223 ammo can be safely fired in a rifle chambered in 5.56 mm. The 5.56 chamber is cut a bit longer than .223 to help insure operations in the field in the presence of dirt, etc. 5.56 NATO ammo is also loaded to a higher pressure than .223. So- to recap- 5.56 in a .223- NO. .223 in a 5.56- yes.
1 second if you are traveling 15 feet.
Ar-15 for one. You can use .223 ammo in 5.56 barrells as well.
No.
One stone is 14 pounds. 223 pounds is therefore 15 stones 13 pounds.
87-223
Yes, 20 15 vision is better than 20 20 vision.
100x100 15 fps
The View - 1997 16-223 was released on: USA: 15 August 2013
Jeopardy - 1984 3-223 was released on: USA: 15 July 1987