[ddaygold]

The laws banning military grade weapons already exist -- the civilian AR-15 is not an military grade M-16, it is difficult to obtain an automatic weapon, destructive devices are banned-ish.

Fundamentally the problem is that gun ownership is a core American ideal (to enough electorally well placed people), so outright bans are infeasible and other restrictions cause a race by manufacturers to innovate around the restrictions.