a .45 caliber.
Traditionally they carry the military-style Model 1911 Colt .45 caliber semi-automatic pistol.
No! What's the matter with you?
45 caliber Machine Gun and 50 caliber machine gun
a .45 caliber.
The short answer is no. The longer answer is, you might be able to get a .40 caliber cartridge to fire from a .45 caliber gun, but it may damage the gun, and even if it doesn't damage the gun, it will cause other problems. In general (with only a few exceptions) you should never try to fire any cartridge in any gun other than a gun designed for that caliber.
Anywhere from $50 to $25,000. Depends on which gun. Caliber 45 refers to the size of the bullet, and nothing else.
No.
.45 ACP
45 colt
yes
As long as you have a Maryland handgun permit and as long as the gun meets any specific requirements in Maryland law.