The successor of the 6X3 bayonet was the much more improved 6X4. This design was very successful and was the most produced one. The AK-74 rifle was also designed to be compatible with this bayonet. The 6X4 was made both by IzhMash and TOZ.
The blade shape of all versions of 6X4 AK bayonets is almost identical to that of their predecessor – 6X3, however, the handle on the 6X4 represents a single piece part (made of a material called AG-4V (АГ-4В)) which is glued to the tang and fixed in place via a cross pin. The pommel of the handle is a rather large metal part with the attachment mechanism of the bayonet built into it. During its production years (1965-1985), this bayonet has been changed several times resulting in the existence of four different versions.