developed the 6-round full-moon clip. However, many civilian shooters disliked using moon clips. Although full moon clips allow a 1917 to be very quickly reloaded, loading and unloading the clips is tedious, and bent clips can bind the cylinder and cause misfires. For these reasons, in 1920, the Peters ammunition company introduced the .45 Auto Rim. This rimmed version of the .45 ACP allowed both versions of the Model 1917 revolver to fire reliably without the clips. In the late 1950s and 1960s, Colt and Smith & Wesson 1917s were available through mail order companies at bargain prices. In 1937, Brazil ordered 25,000 Smith & Wesson M1917s for its military, where they are no longer in service. They can be identified by the large Brazilian crest stamped on their sideplates and are sometimes referred to as the M1937, the Modelo 1937, or the Brazilian-contract M1917. They have altered rear sights, a "Made in U.S.A." stamp on the left sideplate, and most were fitted with commercial-style checkered grips (though some utilized smooth grips left over from the United States contract). These Modelo 1937 revolvers were shipped to Brazil until 1946, and some surplus batches have been re-imported back into the U.S. for commercial sale since then. Users See also Service Pistol Smith & Wesson Model 10 Smith & Wesson Triple Lock Smith & Wesson Model 22 References Further reading Field Manual 23-35 Pistols and Revolvers, 26 February 1953 Smith, W.H.B: "1943 Basic Manual of Military Small Arms" (Facsimile). Stackpole Books, Harrisburg, Pennsylvania (USA), 1979. Speer Reloading Manual Number 3, Lewiston, Idaho, Speer Products Inc., 1959 Taylor, Chuck: "The .45 Auto Rim," Guns Magazine, September 2000 Venturino, Mike " WWI Classic Returns", Guns Magazine December 2007, San Diego, Publishers Development Corp. 2007 Colt revolvers Military revolvers Revolvers of the United States World War I infantry weapons of the United States World War II firearms of the United States Revolvers of Brazil .45 ACP revolvers Weapons of the Philippine Army