The .40 caliber cartridge took the industry by storm in both law enforcement, as well as commercial sales. It really bridged the gap between the 9mm and the .45 Auto cartridge. The first pistols introduced were the Glock 22 and SW 4006, both of which were scaled up 9mm pistols. The 4006 was the pistol the .40 cartridge was designed with. It is a heavy stainless steel pistol that is well suited for the new caliber. This pistol was not necessarily a real success compared to others but it was significant in the development of an industry legend.
 


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