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 developed as a joint venture between Winchester and Smith & Wesson. It was an effort to to create a cartridge with the same power as the 10mm Norma round that the FBI had just started using, but in a shorter case. The shorter cartridge would facilitate accuracy and allow use of a smaller, more comfortable grip frame. The .40 S&W has become the cartridge of choice for many law enforcement agencies in the United States.