From NRA Blog …

The HK MP5 was developed in Germany during the 1960s. The model used in the movie, the MP5A3, has an effective range of approximately 600 feet with a muzzle velocity of 1,300 feet per second. Weighing just over six pounds, this particular firearm is popular with military and law enforcement units in dozens of countries include Canada, Denmark, Italy, and the United States.

But for the whole story, including whether or not the special forces unit in Die Hard 2 could actually switch between blank and live rounds, join Phil tonight at 10:40 eastern standard time on Curator’s Corner, broadcast live on NRANews.com or Sirius/XM Patriot Satellite Radio.