Most are chambered for the 5.56x45 cartridge, and can also fire the .223 Remington. However, AR-15 type rifles are available in a number of calibres. 9x19mm, .40 Smith & Wesson, .45 Automatic Colt Pistol, .22 Long Rifle, 5.45x39, 7.62x39, .223 Wylde, .204 Ruger, 6.5 Grendel, and 6.8 Remington SPC are some of the available chamberings.
Most barrels will be marked 5.56 , so you are able to use 5.56 or .223 ammunition.
Yes
AR15, M16, M4, Ruger Mini 14
Depends on markings on upper.
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.32 S&W ammo
Whatever they could fit into it.
You may use any brand of 7mm Magnum rifle ammo.
22 Long Rifle
First do a full functional clear, eject the mag, rack the bolt/carrier to eject any casing. Next fully clean the gun. Check for broken or weak parts in bolt/carrier, gas system, and buffer system. Use quality ammo. If it still doesn't then take the gun to someone who knows how to work on ar15 rifles.
The US Army presently uses the M4 carbine, a shorter and much modified version of the Armalite AR15.
30/06, 150 grain
its an ability, some classes don't get, otherwise just use the ammo ability to equip it.