Thats not entirely true....
With my skills I would design a better weapon than the AR, something like the Metalstorm.
Of which is built in Brisbane.
You can own guns in Oz, you can make guns in Oz, the government is at peace, no gun grabber mobs there, no nosey neighbors looking for a reward.
Sounds to me like you're saying that you can get away with breaking Australia's gun ban laws if you're careful.