The CBSA should just be mad to actually operate within the bounds of law and....general sanity. A mechbox is not only a paper weight without a toy gun to put it in, but it's also not even applicable to any other situation in life. WTF else could you do with it.... It's the most toyish part of a bigger toy.
They should actually make their employees informed to laws such as those to do with firearms. If recievers are illegal fine. Again, I put $100 on the line that says if I ordered and AEG and had everything shipped, but reciever, it'd be siezed....because it looks scary and the seizee knows nothing about firearms.
Anyway, fight for things that get seized that have no history of being seized before. It's an attack on our rights and freedoms.