About the Handgun:
The P239 was developed in response to demands from law enforcement and federal agents for a compact back-up pistol ideal for off-duty concealed carry. Technically it is similar to P228 compact gun, and differs only in size and magazine. While P228 has a double-stack magazine for 12 rounds, P239 has a single-stack magazines for 7 or 8 rounds (depending on caliber). The slim profile of this single-stack pistol provides easy concealment without sacrificing handling.
About the Manufacturer:
SIG was established in 1853 to make railway rolling stock but has since attained an remarkable record for excellence in the design and manufacture of firearms. The company has specialized in military weapons, primarily for the Swiss army, and since 1945 has been making pistols that rank among the world's finest. In the 1970s a partnership was formed with J.P Sauer & Sohn, allowing SIG designs to be made in Germany. Thus, the SIG Sauer line of handguns began, starting with the SIG Sauer P220 handgun in 1975. In 1985, SIGARMS was created as the American branch of SIG in Tysons Corner, Virginia to import the P220 and P230. In 1987 SIGARMS moved to Herndon, Virginia, and in 1990 moved to Exeter, New Hampshire to accommodate new manufacturing. On October 1, 2007 SIGARMS officially changed their name to SIG Sauer.
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.