I got myself the 10oz. My young nephew thinks they are great, he doesn't stack silver but he wants these 'bullets'.
I was wondering would the airport guys freak out if they saw these on the 'x-ray' machine in your hand luggage?
Totally. Silver shows up black - how do you think security at a gate are going to react to what appears to be ammunition in your carry-on. I wouldn't expect to be able to proceed with them, and you would probably have some face-time with the AFP trying to explain why you're carrying replica ammunition onto an airplane and at least miss a flight - and then an airline gets to decide if they want you as a passenger or not after being delayed because "oh the police thought I had ammo in my bag",
Maggie and I both looked into the legalities of these when they were first discussed for import into Australia - couldn't turn anything up that would make them a prohibited item - but an airport is just one place you would not take these. You would certainly be the "interesting event" of the day for security staff and police.