What makes Colt’s M4A1 so remarkable is the night-and-day difference between how this gun is manufactured compared to every other Colt firearm. You have to see it to appreciate it.

The U.S. Army has been buying M4 carbines through an exclusive arrangement with Colt ... with Colt in 1999 to produce the M4/M4A1, ... Colt's March, 2011, M240L machine gun contract award ...

Colt's Manufacturing Company and FN America have each been awarded $88.6 million by the U.S. Army for the production of M4 and M4A1 carbines.