"Assault weapon" shall also mean any semiautomatic, centerfire rifle that has the capacity to accept a detachable magazine and any one of the following:
A pistol grip that protrudes conspicuously beneath the action of the weapon. A thumbhole stock. A folding or telescoping stock. A grenade launcher or flare launcher. A flash suppressor. A forward pistol grip.
"Detachable magazine" means any ammunition feeding device that can be removed readily from the firearm with neither disassembly of the firearm action nor use of a tool being required. A bullet or ammunition cartridge is considered a tool.