357. Revolvers with flat mainsprings have to have a metal framework to anchor one close, when another contacts the hammer. This framework usually forms the primary condition on the handgrip, to which the stocks are hooked up. The Dan Wesson design properties the coil mainspring inside a brief extension from https://ricardoaxupm.blogadvize.com/47767513/dan-wesson-high-precision-barrel-an-overview