This is my G3 assault rifle bayonet, this particular model was made by Eickhorn and the bayonet is marked HMAK for the Danish army. The bayonet attaches above the barrel using the adaptor pictured.
The G3 bayonet was designed by each of the firms contracted to begin G3 rifle production in 1959, and was produced in small numbers by Carl Eickhorn Waffenfabrik. H & K's G3 bayonet was widely adopted and became the standard G3 bayonet used by the German Bundeswehr for nearly 40 years. The G3 bayonet's odd hilt design was unlike anything that preceded it. It has never subsequently been copied, making it a unique design. The G3 bayonet's long production period and production in many countries resulted in numerous variations.
( PS,THE LAST 2 PICS I GOT ONLINE)