Eventually several companies used this idea and a few years later Nichols invented a plastic bullet that was inserted into a hollowed out version of the regular 2-piece bullet and when the gun was fired, the plastic pellet shot out of the end of the barrel.
Eventually several companies used this idea and a few years later Nichols invented a plastic bullet that was snapped into a hollowed-out version of the regular 2-piece bullet with a compression spring inside. When the gun was fired, the spring pressure "shot" the plastic pellet out of the end of the barrel.