The Comp III's spring driven action provides the fastest, most positive reloading available. Depending on the gun, all Safariland speedloaders may require custom grips to ensure proper clearance. Fits Dan Wesson 38/357; S&W 10K, 12K, 13K, 14K, 15K, 19K Frame, S&W 64K, 65K, 66K, 67K, 68K Frame.