Many Bushmasters change hands for around a grand or a little more or a little less, depending.
$1200
You need to specify an exact model . Bushmaster makes and has made a variety of rifles in this caliber - not just AR-pattern rifles, but also the ACR, M17S, and others. The length varies by model.
anywhere from $800 - 1200, depending on accessories
Check your barrel. If it says it's rated for .223 ammunition, firing 5.56 could cause damage. 5.56 is a higher-power load. If your barrel is rated for 5.56, then you're all set! Failing to find the barrel's rating: Bushmaster's web site and catalog can answer your question.
No
I wouldn't. Range of 9mm is 50 yards. Only good for close up work. Magazines are hard to come by. 5.56 or 223 has a range of 300-600 yards, ammo is easily available, magazines are everywhere.
Yes, but 5.56 ammo should not be used in a .223 Remington chamber.
No.
Caliber refers to the diameter of a bullet (bullet is the part of a cartridge that is fired out of the gun). A .223 caliber bullet is .223 inches across. It is normally used as a rifle cartridge. a .45 caliber bullet is more than twice as wide as a .223, and is usually used in pistols. The .223 is lighter- it weighs about 1/4 of a .45 bullet, and they are different shapes- .223 is usually pointed, the .45 is rounded.
Check your local sporting goods stores- but in GENERAL, the .223 is a more popular cartridge, and is less expensive than 22-250.
The factors of 223 are: 1, 223 (223 is a prime number).
.223 and 5.56 x 45 can SOMETIMES be used in the same barrel. Mostly in AR style weapons.