The M45A1 CQBP pistol was adopted in 2012 by the United States Marine Corps.  Initially built for the military, commercial variations of the pistol also have been released. 

On July 20th, 2012 the USMC System Command announced that the winner of the new CQBP pistol contract was Colt Defence LLC of Hartford, Conn.  It stated that Colt would deliver 4,000 samples initially and up to 12,000 samples in following years.  The contract was said to be worth $22.5M to Colt.  On September 30th, 2016 the USMC announced that all 1911 type pistols still used by it's special operation units would be replaced by the Glock 19.