The bullet was fired by a 14-year-old boy, police said.
The precinct had six shootings since January 2015, compared to seven in all of 2014.
There were 28 more shooting incidents than last year in the month prior to April 14, police said.
The painting went up this week on a sneaker shop's rolldown gate on Flatbush Avenue and Maple Street.
The move comes after a SNUG employee was arrested Thursday for pulling a knife on a colleague's spouse.
The mayor said he was unaware of problems at the Mission Society's Harlem SNUG site.
The ShotSpotter program will roll out to five different areas in Brooklyn and The Bronx.
The 103rd Precinct recorded one shooting since Oct. 24 last year, the commanding officer said.
The 79th Precinct's streak is attributed to community partnership and an "omnipresence" of officers.
Jovan Frederick, 32, faces attempted murder, assault and robbery charges, police said.
Police from the 84th Precinct took two weeks off patrol after Dets. Liu and Ramos were shot to death.
The victim in the Dec. 18 shooting was not the intended target, police said.
A recent fight between two gang-affiliated groups fueled an uptick in shootings, officials said.
Jaquay Bennett was killed and a 17-year-old gang member was injured last week in Crown Heights.
Mayor de Blasio and Bratton announced a 4.6 percent drop in serious crime in 2014.
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