What is ap vs sp pistol?

In NRA terms, this is Air Pistol and Standard Pistol. These are types of pistols used in International style pistol matches. Air Pistol is usually a 60 shot slow-fire match. Standard Pistol generally consists of 20 slow-fire, 4 x 5 shots in 20 seconds, and 4 x 5 shots in 10 seconds (rapid rife). In addition, on my collegiate pistol team we also competed in Free Pistol (FP). That is for light trigger, single-shot pistols with advanced grips. SP and FP use .22 rimfire ammunition.