Conservative caucus chair Guy Lauzon and NDP caucus chair Glenn Thibeault met in the rotunda, the grand hall through which Zehaf-Bibeau entered Centre Block last Wednesday, to shake hands in a show of solidarity.
Both men said MPs still feel safe in the parliamentary precinct.
The Conservative and NDP caucuses meet in large committee rooms with entrances in the Hall of Honour where last week's shootout happened. At the time, no one knew it was a single gunman: all the MPs knew was that there were dozens of gunshots fired in the hallway next to them.
The Liberals meet in a smaller caucus room one floor below.
The NDP welcomed House of Commons guard Alain Gervais, who used his body to block the door to the hallway. MPs say a bullet hole in the door serves as a reminder of the risk he took. The bullet went through the first set of wood doors and entered a second interior door but stopped there, around the place where Gervais's head was.