Semmerling LM4

The Semmerling LM4 is a five shot, manual repeating double action pistol designed for backup purposes.

Concept and History
The Semmerling series of pistols included the LM1, LM2, LM3, LM4 and XLM. The only version available to the public was the LM4 which was first designed and manufactured in the U.S.A. in the early 1980s and marketed at a price of US$750. The "LM" in the model numbers stands for "Lichtman Model", after the inventor of the design, Philip R. Lichtman. Lichtman applied for and received at least four United States Patent's related to the design.

The goal of the LM4 was to achieve a combination of the highest practical firepower in as small and light a gun as possible, so as to be easily concealable. This was approached by selecting the service caliber of .45 ACP for its proven stopping power and opting for a manual repeating mechanism to minimize bulk and weight and ensure flawless operation in the most difficult situations. Because of this the LM4 was first offered to the U.S. Army and government agencies.

The Semmerling LM4 has 33 parts (including screws), making it one of the simplest guns ever made. In the original design, every part except for the springs was made of high-quality S-7 tool steel. Every pistol was Magnafluxed (a method of testing ferrous metals for surface and subsurface flaws) twice in their assembly, making the LM4 one of the most carefully constructed pistols produced.

Each pistol was essentially handmade to order with production averaging a little over ten pieces a month, while maintaining very strict quality control procedures to ensure a high degree of reliability and functionality. Of the LM4 model, only about 600 were ever produced.

Although the Semmerling was intended as a back-up pistol for those most at risk of having their primary weapon taken from them, some adopted the pistol as a "hide-out" weapon. Capable of a "shot-a-second" firing rate, a practiced shooter can achieve an outstanding shooting performance. With the magazine loaded and a round in the chamber, the Semmerling LM4 is capable of carrying five .45 ACP rounds.

During 2005, the largest collections of Semmerlings comprising examples of the LM1, LM2, LM3, LM4 and the XLM along with all prototypes, tooling, drawings, production and testing equipment, advertising materials and leather accessories were provided to The National Firearms Museum, The Cody Firearms Museum and the Smithsonian. The XLM was a military contract for an automatic version (not manually operated), making the Semmerling XLM the smallest .45 ACP automatic ever produced.

A stainless steel version, not part of the Semmerling Corporation's efforts, has been available at request from the American Derringer corporation since about 1995.

Finish and accessories
The original standard color was matte black with highly polished slide frames. A complete high polish blued finish or a hard chrome plating were optional. A factory presentation model was produced with a high polished gold plated slide.

Grips

 * Plastic
 * Ebony
 * Cocobolo
 * "Thin kit": steel side plate

Accessories

 * Optional two-stage trigger
 * Gun holster
 * Magazine holster
 * Skeleton "thin kit" Grip, allowed for round counting
 * Minor replacement parts kit
 * Major replacement parts kit

Operation
The Semmerling fires from a static, fully locked breech, producing considerable recoil. The barrel mechanism is manually pulled forward to eject the fired round, then pushed back to chamber the next round. This can be accomplished by thumb. For carry, the slide is locked in the closed position by means of a tiny lever located in the middle of the weapon. By carefully pulling the trigger back approx. 1/4 inch and pressing on the lever, the lever clicks into "lock" mode. Hold the lever down and release the trigger. The Semmerling's action is now locked closed with a round in the chamber. To fire, the trigger is pulled back fully. When there is a cartridge in the chamber, the extractor protrudes 1/8 of an inch, so as to act as loaded chamber indicator. Thus, even in the dark the owner can determine the exact condition of the weapon.

It has no safety, decocker, or slide release.

The number of remaining rounds could be seen by using the "thin grip" kit or by removing the grips when carrying the LM4.

Additional Specifications

 * Patridge sights
 * Accuracy: 3" groups at 25 yards, 6" groups at 50 yards

Additional Topics
It is also the signature gun used by Repairman Jack in a series of novels by F. Paul Wilson.