Colt

Colt was a pre-war weapons manufacturer in United States.

They are known for the Colt 6520 10mm Pistol, Colt 6504 9mm autoloader and the Colt Rangemaster Hunting Rifle.

Due to the strong resemblence and function of the N99 10mm Pistol to the civilian Colt 6520 10mm Pistol, it's logical to conceive that the N99 is the military counterpart to the Colt 6520 therefore Colt had been contracted to manufacture the N99 model for the United States Armed Forces prior to The Great War. This hasn't been confirmed by canon sources, though.

Mentions
Colt 6520 10mm Pistol appears in Fallout and Fallout 2. Another product, the Colt Rangemaster Hunting Rifle, appears in Fallout, Fallout 2 and Fallout Tactics. Colt 6504 9mm autoloader was to appear in Van Buren.

Real World Equivalent

 * Real-world Colt's Manufacturing Company in Wikipedia.

Colt