User blog comment:Griever0311/Ask A Marine: Hammerdown/@comment-1260687-20100408134158

@Apepa: I was never able to "fix bayonets"; when I carried the M16A4, it had an attached M203, precluding the attachment of a bayonet, but I never ran into a situation where fixing my bayonet would have been more effective that just using it as a traditional combat knife.