The KJB is based on the Majority text.
The English King James Bible is compiled from the correct manuscript source, translated from the original Greek text: and has been diligently compared and revised with the former translations, by his Majesty's special command, and is appointed to be read in the Churches.
The Majority Text which geographically originates from Syria, Antioch comprises about 99% of the over 5,000 surviving manuscripts that exist today. These manuscripts have a high degree of consistency with each other unlike the Minority Text.