Zen Meteor is a really cool gun, but it's unique ability, Dynamite with a Laser Beam, does not need to be based on time. The Dynamite shot should stay in your magazine until you fire it, reload, or die/go to orbit.
I would love to use this gun in more activities, but it feels more like a gimmick right now. Removing the timer would allow Zen Meteor to be viably applicable in all sorts of situations. If you feel like removing the timer will disrupt the weapon sandbox, then maybe increase it from 5 to 10 seconds.
Also, please display the actual timer like you do with Roadborn or Gunslinger's Trance, for example.