I've quoted from another website (thefirearmblog.com) :
Strict scrutiny, if applied to all 2nd Amendment cases, would entail all gun laws being subject to three tests. Once the court determines that strict scrutiny should be applied, the challenged law or policy is presumed to be unconstitutional. The government has to prove it passes the strict scrutiny tests. First, the law or policy must serve a compelling government interest. Secondly, the law must be narrowly tailored to achieve that interest. Thirdly, it must be the least restrictive means of achieving that interest.
High capacity magazine bands, assault rifle bands, May Issue would all fail this test...