Technically, both the P650 and P650L can drive 3/8" length pins. However, because of the Auto-Lockout feature in the P650L, the trigger will lock by default if 3/8" pins are used. The tool can drive 3/8" pins as long as the Lock-Out Override is depressed. But because of the inconvenience of constantly needing to depress the override, we do not recommend the use of the P650L if 3/8" length pins are heavily used.