The police aren't sure if the equipment has been stolen or if they've just lost track of it.
The 12 gauge shotgun is capable of firing conventional as well as non-lethal ammunition.
The other missing gear includes smoke canisters and special protective vests.
Police Chief Jamie Graham says all the missing equipment can be easily identified as police-issue and he's urging anyone who finds it to call 911.
He says 10 detectives have been assigned to track down the gear, and police are upgrading their inventory control system. (CFAX)