Impossible to answer with the information given.
The Unloaded Gun - 1911 was released on: USA: 4 July 1911
Mind you that "Colt" is not just the name of the gun, it is also the manufacturer of it, too.
.357 magnum
.357 magnum
"Best" is too subjective to define for a hand gun. The biggest, the most practical, the most accurate, the most concealable, and the most durable pistols are all totally different guns. Two very popular models are the 9mm Glock and .45 caliber 1911. Both are used extensively by law enforcement and military personnel.
10-1000 USD depending on speicifics
I know that kimber still makes a 10mm handgun.
Colt makes a 1911-A1 Pellet gun made by Umarex. I know of no BB gun unless you are asking about an Air Soft gun. The Pellet gun is very good. I can not answer about an Air soft gun.
The MP40 is definitely the best gun, with its high damage and mobility makes it CrAzY.
Any firearm that is chambered for it. Hungary makes a hand gun that fires this round.
The Mossberg 500 series is the best self defense hand gun in the 200 to 300 dollar range.