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.
$1200
anywhere from $800 - 1200, depending on accessories
The 223 is considered a Short Action rifle.
.223 is considered a short action cartridge.
.223 inches.
Short action.
Not without modification. Some 5.56x45 and .223 Remington rifles have a device available for them which allows them to fire .22 Long Rifle rounds... typically, the device replaces the bolt carrier group.
A rifle with a 5.56x45 chamber can utilise .223 Remington cartridges. A rifle with a dedicated .223 Remington chamber cannot accommodate 5.56x45 cartridges. A rifle with a .223 Wylde chamber can accommodate .223 Wylde, .223 Remington, and 5.56x45, but neither a rifle with a 5.56x45 or a .223 Remington chamber can accommodate the .223 Wylde cartridge.
Bushmaster carries a product line of semi-automation pistols and rifles similar to the M4 design. Bushmaster originated in 1973 and is based out of North Carolina.
5.56mm by 45mm long. This is similar to, but not the same as .223
The .22 Long Rifle is a rimfire, whereas the .223 Remington is a centerfire cartridge. The .223 uses a longer 'spitzer' projectile vs. the rounded projectile of the .22 LR. The .223 tends to be a heavier projectile, and has a much higher velocity than the .22 LR.
100-500