<human>:  What are the differences between a semi-automatic and a fully automatic rifle?
<bot>: The main difference between a semi-automatic and a fully automatic rifle is that a semi-automatic rifle only fires one shot every time the trigger is pulled and requires manual reloading between shots, whereas a fully automatic rifle will continuously fire for as long as the trigger is held down and does not require manual reloading. Semi-automatic rifles generally have a slower rate of fire than fully automatic rifles, and may be limited in the amount of ammunition they can fire per minute.