357. Revolvers with flat mainsprings needs to have a metal framework to anchor a single close, while the other contacts the hammer. This framework normally varieties the first condition of the handgrip, to which the stocks are attached. The Dan Wesson design houses the coil mainspring inside a short extension https://dan-wesson-firearm-models70369.amoblog.com/facts-about-dan-wesson-usa-firearms-revealed-61294522