Disassembling your guns displays that you know importing replicas is illegal, yet you are trying to "sneak" them in. This is a sure way to get caught, and remove any benefit of doubt from the agent checking your luggage. Leave the guns, launcher and any M203 rounds you plan to bring.
People have imported, had their guns checked and cleared by customs on the ground, but that's iffy at best. The official policy of the CBSA is NO when it comes to replicas, and they hold all the cards in determining what is or is not a replica at the border.
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.