A Big Apple migrant armed with a loaded AR-15 assault rifle and his Mexican cartel pal are both back on the streets — despite allegedly ganging up on NYPD cops at a Bronx subway station.

Abraham Sosa, 20, a migrant living above a Bronx day care center, was hit with assault, gun possession, resisting arrest and trespassing charges after being nabbed urinating in a subway tunnel on Nov. 5 — while lugging the assault weapon in his backpack, according to sources and records.

His pal, 21-year-old Christopher Mayren, allegedly jumped into the fray when Sosa got into a scuffle with New York’s Finest, leaving two cops injured, according to a criminal complaint.

Yet both thugs are free, Sosa after posting a $25,000 bond and Mayren released without bail.