About the Handgun:
Daewoo pistols use delayed blowback action instead of the relatively more common recoil action of most automatic pistols. Other pistols which use the delayed blowback include the H&K P-7 Series and the Vector CP-1. The pistols have a special Tri-Action trigger pull which provides the same trigger pull with the hammer down as most single action automatics. The general appearance is that of a SIG 226. The DP51 is designed primarily for military and police use. It is the standard sidearm of the South Korean armed forces. The DH40 is popular with South Korean Police.
About the Manufacturer:
Daewoo Precision Industrial Co., now a subsidiary of S&T Motiv, was established as a precision defense equipment manufacturer in 1981. This is one of the several Daewoo subsidiaries and is, in fact, the old South Korean Arsenal at Pusan which was taken over by Daewoo and now produces both military and commercial arms. Daewoo makes a variety of firearms, most of which are not imported to the US.
About the Cartridge:
This cartridge was introduced along with the Luger semi-automatic pistol. The pistol and cartridge was first adopted by the German Navy in 1904 and then by the German Army in 1908. This cartridge has since been adopted by the military of practically every non-Communist power. It has become the most popular and widely-used handgun cartridge in the world. Performance wise, the 9mm cartridge has somewhat more power than the .38 Special but falls well short of the .357 Magnum.