It Appears Impossible To Legally Buy A Handgun In DC

Really, there's only one person in DC that can do this? I thought monopolies were against the law. Doesn't this kind of go against the Heller decision? He's denying all those folks of their 2nd Amendment Right under the Constitution.
TSgt David L., PVT Mark Zehner
SGT James Murphy, CPT Jack Durish,
PO3 Bob McCord, LTC Laura Wickett,
SGT (Join to see), COL Mikel J. Burroughs,
SPC Gary Welch, SGT Mark Anderson,
CPL Douglas Chrysler, Maj Marty Hogan,
1SG Steven Imerman, SGT Gregory Lawritson,
MSgt Robert "Rock" Aldi, PO1 John Johnson,
MSgt David Hoffman, SSG Michael Noll,
SPC Nancy Greene, SSgt Terry P.