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The lug will allow a bayonet to be attached but won't fit properly. The barrel is too long so the bayonet's handguard loop will sit losely on the barrel instead of locking around the flash hider. This shows it pretty well, an M7 bayonet is pictured but the mounting is the same for the M9: https://savannaharsenal.files.wordpress.com/2011/03/m4-16-inch-barrel-bayonet-problem.jpg?w=800