Simplify the following text for a Grade 6 native English-speaking person.
Original: A bayonet ( from French baÃ onnette ) is a knife , dagger , sword , or spike-shaped weapon designed to fit in , on , over or underneath the muzzle of a rifle , musket or similar weapon , effectively turning the gun into a spear .
Simplified: A bayonet ( from French baÃ onnette ) is a knife - or dagger-shaped weapon . It is designed to be attached to a rifle barrel or similar weapon .