Insipred by the motto:
Passion for technology. Rheinmetall is a market leader in the areas of environmentally friendly mobility and threat-appropriate security technology.

I decided to look into the self-definition of some leading weapons manufacturers. I picked what they tell about themselves on their Youtube channels, since probably those have more traffic than their own websites. And since I checked, some of those websites curiously lacked of any about page and similar where they describe who they are.
I'm gonna note nationality/country of origin, although the largest ones (or maybe even all of them) will be multinational obviously. It has to be noted that many/all works on other projects than instruments of murder (or their products can be and do used both in military and civilian equipment, or has civilian applications).
I'll also add couple of product examples, what they designed, manufacture, sell, what they are known about.
Additional information: with one exception, all of 'em used their own - way more sophisticated - version of this https://www.bullshitgenerator.com/ liberally.
Two Wikipee links:
https://en.wikipedia.org/wiki/List_of_modern_armament_manufacturers
https://en.wikipedia.org/wiki/List_of_defense_contract