As a memeber of the NFA they suggest writing to
Federal Minister of Justice and Attorney General for Canada
Ms.Wilson-Raybould
House of Commons
Parliament building
Ottawa, Ontario
K1A 0A6
Going to the NFA website can lead you in the right direction on what should be in the letter.
Also send a copy to Public Safety Minister
Ralph Goodale
same address as above, also it should be know all letters to the government like this are postage free
This can be found on the Canadian postal service website