A moon clip is a ring-shaped or star-shaped piece of metal designed to hold multiple cartridges together as a unit, for simultaneous insertion and extraction from a revolver cylinder. Moon clips may either hold an entire cylinder's worth of cartridges together (full moon clip), half a cylinder (half moon clip), or just two neighboring cartridges. The two-cartridge moon clips can be used for those revolvers that have an odd number of loading chambers such as five or seven and also for those revolvers that allow a shooter to mix both rimless and rimmed types of cartridges in one loading of the same cylinder (e.g., 2 adjacent rounds of .45 ACP, 2 rounds of .45 Colt, and 2 rounds of .410 in a single six-chamber S&W Governor cylinder).
Moon clips can be used either to chamber rimless cartridges in a double-action revolver (which would normally require rimmed cartridges), or to chamber multiple rimmed cartridges simultaneously. Moon clips are generally made from spring grade steel, although plastic versions have also been produced. Unlike a speedloader, a moon clip remains in place during firing, and after firing is used to extract the empty cartridge cases.
The modern moon clip was devised shortly before World War I in 1908. [1] The device then became widespread during the war, when the relatively new M1911 semi-automatic pistol could not be manufactured fast enough for the war effort. The U.S. War Department asked Smith & Wesson and Colt to devise ways to use the M1911's .45 ACP rimless cartridge in their revolvers. The result was the M1917 revolver, employing moon clips to chamber the military-issue .45 ACP ammunition. [2] Smith & Wesson invented and patented the half-moon clip, but at the request of the Army allowed Colt to also use the design free of charge in their own version of the M1917 revolver. After the war, Naomi Alan, an engineer employed by Smith & Wesson, developed a 6-round full-moon clip. [3]
However, many civilian shooters disliked and still dislike using moon clips. Although full moon clips allow a revolver to be very quickly reloaded, loading and unloading the clips is tedious, and bent clips can bind the cylinder and cause misfires. [4]
Moon Clips can be formed by stamped high-carbon steel, heat treated, and finished to prevent rust. Alternatively they can be made from pre-heat-treated stainless steel and cut out using either wire EDM or laser machinery. They can also be made by injection molding plastic. Each process has its benefits and drawbacks such as cost and durability.
Moon clips can be even faster to use than a speedloader with the proper training. Jerry Miculek, an IPSC revolver shooter, has demonstrated the ability to fire six rounds from a Smith & Wesson Model 625 .45 ACP revolver, reload, and then fire six more rounds at the 6 in × 11 in (150 mm × 280 mm) A zone of an IPSC target at 15 ft (4.6 m) in 2.99 seconds. This feat was possible by using moon clips to allow quick and reliable ejection of the fired rounds, and a quick reload of all six chambers at once. [5]
Moon clips have been made available for 19 different calibers including; .30 Carbine, .327 Fed Mag, .380 ACP, 9mm Luger, .38 Super, .38 S&W, .38 Spc, .357 Mag, .40 S&W, 10mm Auto, .41 Mag, .44 Spc, .44 Mag, .45 Colt, .454 Casull, .45 ACP, .45 Super, .460 Rowland, and .460 S&W. [6]
Common revolver models that are manufactured to use moon clips:
A revolver is a repeating handgun that has at least one barrel and uses a revolving cylinder containing multiple chambers for firing. Because most revolver models hold up to six cartridges, before needing to be reloaded, revolvers are commonly called six shooters or sixguns. Due to their rotating cylinder mechanism, they may also be called wheel guns.
The .45 Colt (11.43×33mmR), often called the .45 Long Colt, is a rimmed, straight-walled, handgun cartridge dating to 1872. It was originally a black-powder revolver round developed for the Colt Single Action Army revolver. This cartridge was adopted by the U.S. Army in 1873 and served as an official US military handgun cartridge for 19 years, before being replaced by the .38 Long Colt in 1892. Although there has never been a ".45 Short Colt" cartridge, the .45 Colt is frequently called the ".45 Long Colt" to better distinguish it from the shorter .45 Schofield cartridge, which was also in use around the time the .45 Colt was introduced.
The .44 Remington Magnum, also known as .44 Magnum or 10.9x33mmR, is a rimmed, large-bore cartridge originally designed for revolvers and quickly adopted for carbines and rifles. Despite the ".44" designation, guns chambered for the .44 Magnum round, its parent case, the .44 Special, and the .44 Special's parent case, the .44 Russian all use 0.429 in (10.9 mm) diameter bullets. The .44 Magnum is based on the .44 Special case but lengthened and loaded to higher pressures for greater velocity and energy.
The .32 S&W Long / 7.65x23mmR, often called the .32 Long, is a straight-walled, centerfire, rimmed handgun cartridge, based on the earlier .32 S&W cartridge. It was introduced in 1896 for Smith & Wesson's first-model Hand Ejector revolver. Colt called it the .32 Colt New Police in revolvers it made chambered for the cartridge.
A wildcat cartridge, often shortened to wildcat, is a custom-made cartridge for which ammunition and/or firearms are not mass-produced. These cartridges are often created as experimental variants to optimize a certain ballistic performance characteristic of an existing commercial cartridge, or may merely be intended as novelty items.
A rim is an external flange that is machined, cast, molded, stamped, or pressed around the bottom of a firearms cartridge. Thus, rimmed cartridges are sometimes called "flanged" cartridges. Almost all cartridges feature an extractor or headspacing rim, in spite of the fact that some cartridges are known as "rimless cartridges". The rim may serve a number of purposes, including providing a lip for the extractor to engage, and sometimes serving to headspace the cartridge.
A speedloader is a device used to reduce the time and effort needed to reload a firearm. Speedloaders come in a variety of forms for reloading revolvers, or the magazines used with other types of firearms such as rifles and shotguns.
The Smith & Wesson Model 625, is a six-round, double-action revolver chambered for the .45 ACP using moon clips. The Model 625 is an improved stainless steel version Smith & Wesson Model 22 and a direct descendant of the Smith & Wesson M1917 revolver first issued during World War I.
The M1917 Revolvers were six-shot, .45 ACP, large frame double action revolvers adopted by the United States Military in 1917, to supplement the standard M1911 pistol during World War I. There were two variations of the M1917, one made by Colt and the other by Smith & Wesson. They used moon-clips to hold the cartridges in position, facilitate reloading, and to aid in extraction since revolvers had been designed to eject rimmed cartridges and .45 ACP rounds were rimless for use with the magazine-fed M1911. After World War I, they gained a strong following among civilian shooters. A commercial rimmed cartridge, the .45 Auto Rim, was also developed, so M1917 revolvers could eject cartridge cases without using moon-clips.
The .38 ACP, also known as the .38 Auto, .38 Automatic, or 9×23mmSR, is a semi-rimmed pistol cartridge that was introduced at the turn of the 20th century for the John Browning-designed Colt M1900. It was first used in Colt's Model 1897 prototype, which he did not produce. The metric designation for the round is 9×23mm SR (semi-rimmed), which is not to be confused with other 9×23mm cartridges.
Charter Arms Co. is an American manufacturer of revolvers. Since its founding in 1964, Charter Arms has produced revolvers chambered in the following calibers: .22 Long Rifle, .22 Winchester Magnum, .32 Long, .32 H&R Magnum, .327 Federal Magnum, .38 Special, .357 Magnum, 9×19mm Parabellum, .40 Smith & Wesson, .41 Remington Magnum, .44 Special, .45 ACP, and .45 Colt.
The Super Redhawk is a line of double-action magnum revolvers made by Sturm, Ruger beginning in 1987, when Ruger started making weapons using larger, more powerful cartridges such as .44 Magnum, .454 Casull, and .480 Ruger.
A snubnosed revolver is a small, medium, or large frame revolver with a short barrel, generally less than 3 inches in length. Smaller such revolvers are often made with "bobbed" or "shrouded" hammers and there are also "hammerless" models ; the point is to allow the gun to be drawn with little risk of it snagging on clothing. Since the external movement of the mechanism is minimal or nil, shrouded and hammerless models may be fired from within clothing. The design of these revolvers compromises range and accuracy at a distance in favor of maneuverability and ease of carry and concealment.
The Ruger Redhawk is a DA/SA, large-frame revolver introduced in 1979 by Sturm, Ruger & Company.
In firearms, the cylinder is the cylindrical, rotating part of a revolver containing multiple chambers, each of which is capable of holding a single cartridge. The cylinder rotates (revolves) around a central axis in the revolver's action to sequentially align each individual chamber with the barrel bore for repeated firing. Each time the gun is cocked, the cylinder indexes by one chamber. Serving the same function as a rotary magazine, the cylinder stores ammunitions within the revolver and allows it to fire multiple times, before needing to be reloaded.
The .45 Auto Rim, also known as 11.5x23mmR, is a rimmed cartridge specifically designed to be fired in revolvers originally chambered for the .45 ACP cartridge.
The Smith & Wesson Model 22 is a 6-shot, double-action, large frame revolver chambered in .45 ACP using moon clips. It's a refined commercial version of the M1917 revolver first issued during World War I.
The Colt New Service is a large frame, large caliber, double-action revolver made by Colt from 1898 until 1941. Made in various calibers, the .45 Colt version with a 5½" barrel, was adopted by the U.S. Armed Forces as the Model 1909.
The Ruger Security-Six and its variants, the Service-Six and Speed-Six are a product line of double-action revolvers introduced in 1972 and manufactured until 1988 by Sturm, Ruger & Co. These revolvers were marketed to law enforcement duty issue, military, and civilian self-defense markets.
The Medusa Model 47 is a revolver manufactured by Phillips & Rodgers Inc. of Huntsville, Texas, in the late 1990s. Based on the Smith & Wesson K frame, it is notable for being capable of chambering and firing approximately 25 different cartridges within the 9 mm caliber family, such as: .357 Magnum, .38 Special, .380 ACP, and 9×19mm Parabellum. While smaller diameter cartridges can be fired, accuracy suffers. The revolver was not a commercial success and the company that produced them ceased operations after just a few hundred units were made.