The S&W .38 Hand Ejector, fixed sight service revolver has, in one form or another, been a best seller in the S&W revolver line since 1899. The Military and Police tag was added immediately after the gun’s introduction, as a result of an 1899 order from the U.S. military for thousands of Smith & Wesson’s new revolvers in the then U.S. service standard .38 Long Colt caliber. In addition, in 1899 S&W introduced a new caliber in the M&P, the .38 Special. (The actual bullet diameter is .357″). This was an enlarged and more powerful cartridge designed to address the stopping power deficiencies of the .38 Long Colt service cartridge. The M&P revolver and the .38 Special cartridge have been associated ever since.