The Zoli XL-Evo Competition gun is completely unique and built with the serious competition shooter in mind. A slight correction to the video below is that while the gun has a Boss style locking bolt, the action is not in fact like a Boss such as Perazzi, Perugini & Visini or our own Horton over and under guns that are in prototype stage. That is not at all in detriment to the Zoli action which is comparably as strong and durable. If you are interested in a Zoli XL-Evo please contact W Horton & Sons to discuss your requirements.