Green’s Dictionary of Slang

shooting gallery n.

also gallery
[pun on SE, the fairground sideshow]

1. [1950s+] (drugs) a place, often an apartment or an abandoned building, used by a number of heroin addicts to take the drug.

2. [1950s] (US drugs) play on sense 3, the hospital ward for drug addicts undergoing withdrawal.

3. [1950s–60s] (UK Und.) a venue for burglary, robbery or other crimes.

4. [2000s] as sense 3 but used for smoking crack cocaine.