David Gregory Charged for Violating D.C. Gun Law?

Back in December, David Gregory took a 30 round magazine for an AR-15 (illegal in DC where his news show was being filmed), and brandished it in the face of Wayne LaPierre, the head of the NRA, to make some point about gun control.  After much fuss was aired in the conservative media and blogosphere to have Gregory charged for violation of D.C.'s strict gun laws, the authorities in D.C. decided not to charge him with violating the law, even though he had been warned in advance.

No, instead, a gun-rights activist has now been charged with possession of a gun in Washington D.C. in violation of those same laws:

Adam Kokesh, a controversial activist seen loading a gun in D.C.'s Freedom Plaza in a video posted to YouTube July 4, has been transferred from Fairfax County and charged in D.C. with openly carrying a shotgun in violation of D.C. laws.

He is specifically being charged with violating the following offense:

Carrying a Rifle or Shotgun (outside Home or Place of Business), in violation of 22 D.C. Code Section 4504 (a-1) (2001 ed.))

The maximum penalty for those who have not previously been convicted of a felony is a fine of $5,000 and/or up to five years in prison.

Those who have been convicted of a felony could face a fine of up to $10,000 and/or up to 10 years in prison.

So, is it justice to administer the laws to favor of activism on the liberal anti-gun legalization side versus the other conservative, pro-gun legalization side?