The dtermination on wheteher a gun is a replica or not is made primarily on the basis of physical appearance. The VSR-10 looks enough like a generic gun, it would be seized based on that alone.
Pellet guns do as well, but they are known to the CBSA to also be capable of serious injury or death, so they do not shoot "harmless" projectiles. This means they can not be replicas.
This is a very watered-down explanation, and it actually is much more complex than that. Most of the determinations are policy driven, and that policy is based on best interpretation of a murky law. Hence the deviations from one agent to another, one agency to another.
Age verifier Northern Alberta
Democracy is two wolves and a sheep discussing what's for dinner.
Freedom is the wolves limping away while the sheep reloads.
Never confuse freedom with democracy.