NEW YORK - Four in 10 adults live in households with guns, and those homes have an average of two firearms each, according to a national poll. Louis Harris and Associates said its survey being released today indicates a leveling off of gun ownership after a decline during the 1980s. In the poll, 25 percent said they had a pistol, 27 percent a shotgun and 29 percent a rifle. Some households have more than one type of gun. Forty percent have at least one gun of any type. The polling company said it found the share of gun-owning households lowest among the very poor, at 17 percent, compared with 54 percent in families that earn $25,000 to $35,000. The Harris Poll interviewed 1,004 adults by phone July 15-21. Results have a margin of sampling error of plus or minus 3 percentage points.