Excellent HK USA video from 1997 covering various weapons available for the law enforcement and military community at the time. (Show more for table of contents and jump to links)

Heckler & Koch Presents: The HK Weapons System - Products for Military and Law Enforcement. Heckler & Koch weapons are known throughout the world as the most technologically advanced firearms available for Law Enforcement, Military and Special Operations users. Now for the first time on video, a comprehensive look at this unique system of weaponry, widely recognized for it's tactical flexibility. Arms included:

Pistols
USP and USP Compact: 1:05
Mark 23: 3:44
P7: 5:53

Special Applications Products
HK21E: 7:22
GMG: 9:04
PSG1 & MSG90: 10:22
HK69A1: 12:22

Rifles
G3: 13:38
HK53, 33 and 33k: 15:04

Submachine guns
MP5 family: 16:52

Benelli Security Shotguns (HK USA imported these at the time)
Intro and M1 Entry: 23:01
M1 Super 90: 23:54
M3 Super 90: 24:49

International Training Division: 25:32
Service and support (including R&D, manufacturing and accessories): 27:18

- Heckler & Koch, Inc. 1997 -
Thanks to Wayne for this video.