During the 1980s, the United States Army attempted to find a replacement for its venerable Colt M16 series rifle family by adopting a design that improved upon first-hit probability by as much as 100%. A handful of entries were considered and, after hundreds of millions of dollars were spent, the program was ended with no clear winner.
There are a total of (4 U.S. Army Advanced Combat Rifle Program Guns in the Military Factory. Entries are listed below in alphanumeric order. Flag images indicative of country of origin.