I own a Pre-M17, Pre-M18, and M63. They all shoot great, but my favorite, hands-down, is the 4" Pre-M18. Just happened to be shooting it yesterday, and it is amazingly accurate at 60 yards! The M63 is a neat gun, but a little small and light. The Pre-M17 is wonderful to shoot and accurate, but for some reason the Pre-M18 spins my propellor...