A man who lost his life in a shooting at an illegal after-hours bar in Brooklyn was plugged accidentally by his friend and fellow gang member, who unloaded when they got in an argument with another group, according to police.

Gabriel Hernandez, 27, was arrested and charged with manslaughter and weapons possession Wednesday, two days after he allegedly fatally shot Giovanni Rivera, 31, in the back while the men were carousing inside a bar on 50th St. near Third Ave. in Sunset Park around 5 a.m.

Hernandez and Rivera, old pals and allegedly both members of La Raza Loca gang, were drinking inside the bar with the victim’s girlfriend when they got into an argument with a group of four or five men around 4:23 a.m., NYPD Chief of Detectives Joseph Kenny said at a press briefing Thursday.

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