Lets see how the memory works after 30 years:
A rifle is a firearm designed to fired from a shouldered position which can discharge a bullet through a rifled barrel longer than 16 inches. The spiral parallel grooves (rifling) in the bore impart spin to the round, providing stability and extended range. Rifles can be either bolt action (SMLE Mk IV), semi-automatic (L1A1 SLR) or automatic (FN) whereas a carbine is a shortened form of the rifle that has a barrel less than 16 inches in length, and is used, typically, by those who require a weapon for self-defense and emergencies. Carbines usually tend to be semi-auto and are inferior to the rifles in most ways.