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There may be as many as 412-660 Million guns in US

Australia Confiscated 640381 Guns in 1996 Costing $500M AU$

In 1996 1 AU $ was worth 1996 .7912 USD so $500M AU$ was worth $395,600,000

Cost calculated in July 2014 based on an estimated 350M guns in US is $180,400,000,000.

Cost of AU Style gun grab for US: Update 9/13/2015 $191,040,000,000 based on an estimated 363.3M guns in US.

A 1996 US$ is worth 1.57 now(March 19, 2017) so 395,600,000 would now cost 621,092,000

Estimated 412M: 56% of that is 230.75M, that's 360.3 times 640381. 360.3 times $621,092,000 is $223,800,000,000 or about 224 billion.

Estimated 660M: 56% of that is 369.6M, that's 577.15 times 640381. 577.15 times $621,092,000 is $358,400,000,000 or about 358 billion.