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.
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 Corportion's efforts, has been available at request from the American Derringer corporation since about 1995.
The number of remaining rounds could be seen by using the "thin grip" kit or by removing the grips when carrying the LM4.
HAND SHAKE SMOOTHS EXPECTED BUMPS IN ROAD COMMISSIONER TRANSITION `THINGS LEFT ON HAPPY TERMS': SEMMERLING HANDS OVER REINS TO JORGENSEN AFTER TRADING BARBS
May 06, 1997; LAKE VILLA TOWNSHIP--Newly elected Road Commissioner Jim Jorgensen's first day on the job Monday was not what he expected -- he...