The present invention imparts fire-retardancy upon cellulosic products utilizing a cost-effective, non-toxic, and reliable process. A first pivotal support brace including a distal end and a proximal end attached to the first support pedestal. One of those surfaces is generally perpendicular to the direction of the firearm. Other aspects of the system are described, including methods of heat sinking the sensor, a suspension system, methods of compensating for an effect of temperature on the ferrofluid, and a compact magnet configuration for forming the linear motor and providing feedback as to the position of the sensor.