Firearms and ammunition for hunting and sporting purposes, accepted as checked baggage only, provided unloaded, safety catch "on", and suitably packed. Firearms and ammunition for any other purpose are prohibited. Antique firearms, swords, knives and similar weapons may be accepted at the carrier's discretion if suitably packed.
The tariff never uses the terms "restricted" or "prohibited firearm" in the Criminal Code sense - its own prohibition is of firearms carried for a non-hunting/sporting purpose. A separate search-engine cache (see fetch_notes) attributes to flycma.com a sentence stating firearms must be "unloaded and packed in a locked, strong, hard-sided firearm container" and that a Firearms Declaration form is signed at check-in; this could not be verified live and is recorded only as a note, not as sourced fields.
Central Mountain Air’s wording
Firearms and ammunition other than for hunting or sporting purposes are prohibited from carriage as baggage. Firearms and ammunition for hunting and sporting purposes will be accepted as checked baggage provided the firearms are not loaded, the safety catch is in the "on" position and the firearms are suitably packed.
Weapons such as antique firearms, swords, knives and other similar items may be accepted as checked baggage at the carrier's discretion, provided they are suitably packed.