In call of duty: modern warfare 3 (PC version) when playing multiplayer. You can select at weapon level 20 the shotgun attachment for the assault rifle.
How do you fire it?
Does it happen automatically or do you need to use a hot-key ?
How to use the Undermounted Shotgun attachment for assault rifles
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Related Solutions
Here is an unofficial weapon stats chart:
Modern Warfare 3 does indeed support dedicated servers (see here):
Will Modern Warfare 3 have Dedicated Servers?
Yes! Modern Warfare 3 supported matchmaking as well as Dedicated Servers, allowing players to find and filter via an in-game server browser or set-up their own Dedicated Server for complete control, without being restricted by any 3rd party hosting requirements. If looking for a Dedicated Server to join, if you choose not to set up your own, you can filter and favorite by Ping, Map, Gametype, Hardcore Variants, Voice, Password, and many other options.
As for an approved server list, it appears the ranked servers are managed in-game (you have to enable browsing of dedicated servers in the options to even see those); I'll update if I find anything.
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Best Answer
To use an undermounted weapon attachment (either a grenade launcher or a shotgun) you'll need to activate it - this is similar to switching weapons, although it's generally a bit faster than raising or lowering a secondary.
I believe this key can be configured, but by default it is 3. Once you've switched to the undermounted attachment, fire it just like you would any weapon.