This bayonet is historically-significant as the last bayonet designed for use with a Mauser military rifle.

The KCB–77 M6 bayonet was designed in 1989 for the Kingdom of Saudi Arabia by the German firm, A. Eickhorn GmbH & Co. für Schneidwaren und Waffen KG (AES). AES was one of the successors to the famous German blademaker, Carl Eickhorn Waffenfabrik.

The KCB–77 M6's distinctive features are the inverted blade, rectangular hilt, and "sand" color. The small hook on the lower crosspiece is a bottle-opener. The scabbard uses the belt hanger developed by AES to allow the soldier to detach the scabbard body for wire cutting, while leaving the belt hanger attached to the equipment belt. AES also produced the KCB-77 M6 in olive green for commercial sale.

The Kingdom of Saudi Arabia had these made during the run-up to Operation Desert Storm to equip the Saudi Arabian National Guard (SANG). The SANG is a separate paramilitary force loyal to the royal family. Its primary role is internal security to act as a counterbalance against a military coup.

In 1998, 25 KCB-77 M6 bayonets were imported to the USA from AES, 12 olive green and 13 sand color. This example is one of the 13 sand color examples imported in 1998 and is the example pictured on page 315 of Jim Maddox' book, Collecting Bayonets. It is unknown whether there were others imported, however, this bayonet remains very scarce today.

The KCB–77 series are an improvement of the KCB–70 bayonet, which was designed in the late 1960s by Carl Eickhorn Waffenfabrik and the Netherlands firm NWM (Nederlandsche Wapen-en Munitiefabriek) for the Stoner 63A weapons system. Additional information regarding the history/development of the KCB–77 series are on the Post-War Germany page.