At its conference on February 21, SCOTUS had petitions for certiorari - requests for the Court to accept appeals from Federal court decisions - in three significant gun rights cases. This morning, February 24, the Court announced that it was declining to review all three.
Lane v. Holder: Do consumers have standing to challenge Federal gun laws that restrict sales across state lines? (In this case, DC residents want to buy firearms in Virginia but cannot have them transferred, as the law requires, through a dealer in DC because no Federally licensed dealer is currently doing business in the District.)
NRA v. BATFE: Is a 1968 Federal statute constitutional that forbids Federally licensed gun dealers to sell handguns to individuals under the age of 21?
NRA v. McCraw: Is it constitutional for Texas to bar 18-20 year olds from carrying concealed handguns in public? (About two-thirds of the states have such a law.)
Several dozen gun rights cases have been pressed upon the Court since SCOTUS decided Heller in June 2008. It took only one other Second Amendment case, McDonald in 2010, which simply extended to the states Heller's right to have a gun for self-defense in one's home.
Below the surface squiggle, some speculations ...