From the face of the slide to the muzzle. Insert a dowel near the diameter of the bore until it contacts the face of the slide, mark the dowel at the muzzle, withdraw, measure.
Shorter barrels = less MV
Pistol barrels range from 2" to 12", and almost every increment in between. Longer barrels increase accuracy, shorter barrels make for more compactness.
'ACP' means Automatic Colt Pistol. A 1911, for example, would chamber a .45 ACP cartridge.
Schwarzlose pistol
automatic colt pistol
Automatic Colt Pistol
No
No, it is a semi-automatic.
No.
Yes, the Glock 18 is fully automatic.
Yes, Colt has and continues to make automatic pistols.
No. A pistol is designed to be used with one hand. A rifle is usually Automatic except for Sniper Rifles and Firearms of a similar type. However, a pistol is Semi-Automatic.