Some people want to imply that the 2nd cannot be restricted AT ALL. Then those same folks will tell you when it should be restricted.
This isn't necessarily inconsistent. For example, I believe the 2a is (and was intended to be) an absolute but I also believe nuclear arms should be closely controlled. At the same time I recognize denying citizens the right to keep and bear nuclear arms is currently a violation of our rights. The solution is a Constitutional amendment stating explicitly that only weapons of mass destruction can be restricted, and specifically defining what "weapons of mass destruction" means.