Dave Chappelle Attacker's Gun and Knife that Escaped Metal Detector

This photo shows how scary it must have been for Dave Chappelle Tuesday night at the Hollywood Bowl, because the gun/knife that was thrust toward him looked like it could have fatal consequences.

The knife is affixed to the barrel of the gun, like a bayonet. As we reported, the gun was a replica but the knife is real ... real deadly if the attacker had actually used it when he jumped on stage and lunged at Dave, slamming him to the ground.

The big question ... how on earth did the 23-year-old assailant get the gun/knife past the metal detector? Our LAPD sources say there was one entrance area where the metal detector could be circumvented. That itself is a HUGE problem.

As you know, a bunch of people, including Jamie Foxx and Busta Rhymes, pounded on the guy ... who was injured and taken to the hospital. He was arrested for assault with a deadly weapon.

Dave continued his show and was uninjured, but he was clearly shaken up.