Two spots on the U.S. Olympic pistol team are spoken for, and Army Sgt. 1st Class Daryl Szarenski has one of them. But adding another one couldn’t hurt. Szarenski, already en route to his fourth Olympics after earning a berth in the 10-meter air pistol event, will compete for a 50-meter free pistol spot at the Olympic qualification event at Fort Benning, Ga., beginning Thursday. He took 14th in the 50-meter event at the Beijing games last year. The qualifier, which will decide four open spots pistol spots and three smallbore rifle spots for the London games, runs through June…