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The factory rated fps is probably going to be on duster, not propane, so you might be boned.
They don't always go by what the retailer alleges it shoots, sometimes they actually look up the factory specs for it. And CBSA isn't going to care if it's measured on duster or propane.
Especially with GBBRs that are typically rated below 366fps on duster, you should really buy through local retailers to avoid issues with customs.
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