Can u fire two shots at once using Trigger Happy ("+1 extra shot per burst from any weapon")?

Yes, but not with the regular sniper. You can with the CK-Magellan and the others that have more than 1 shot in the clip

ah, okay, thx

does it also work with double barreled shotgun?

Double barrelled shotgun only has a 2 ammo clip and already shoots the 2 shots at once. It will work with dual pistols or Semi-Auto Shotgun.

ok, thanks

Just to be clear, weapons that are not affected by trigger happy: All Bazookas, Sniper, Sparrowhawk, all shotguns except semi-auto shotgun.

Bazooka M25 has potential 3 shot capacity and I have seen it double fire... Not something I would think as particularly useful as the first shot sends over half of them flying quite often and the second shot won't hit those flying in the air.

I'm pretty sure it doesn't double fire. I saw a replay of it not firing twice...

You may be thinking of Nervous and Last Mohican.
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doomys
Just to be clear, weapons that are not affected by trigger happy: All Bazookas, Sniper, Sparrowhawk, all shotguns except semi-auto shotgun. ...and Knife.