The best replacement for bayonet is m9 bayonet.

The best alternatives to bayonet are rated as following:
★★★★★  m9 bayonet
★★★★  spatula
★★★  screw
★★★  flower lens hood
★★  screw mount
★★  bayonet
★★  dagger
★★  spike
★  edison screw
★  okc 3s
★  black horse
★  blackhorse
★  breech lock

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Speaking about bayonet, one probably shouldn't forget about rifle.

Other search terms related to bayonet and their ratings are:
★★★★★ rifle
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bayonet
m9 bayonet
spatula