Warner Bros.’ Steven Seagal actioner “Under Siege” easily broke the October opening-weekend record Sunday with one day left to report in the four-day Columbus holiday weekend.“Under Siege” grossed $ 14,097,770 in its first three days, Friday through Sunday, or $ 6,904 per in 2,042 carriers. WB projected it would pull in $ 17 million for the full four-day frame that ended yesterday. While elbowing previous frontrunner “The Last of the Mohicans” (20th) into second, “Under Siege” easily broke the October opening mark of $ 12,107,784 set by TriStar’s “Look Who’s Talking” in 1,208 nurseries over three days Oct. 13-15, 1989. By the time final returns are in, “Under Siege” also will have shattered the October weekend record of $ 14,147,340 set by “Look Who’s Talking.’ Complete B.O. figures for the four-day weekend will be in tomorrow’s Daily Variety.