The ECHO 2 lol it’s a pretty big boom. I didn’t know they were in the game.
i have one.
Cl4p-TP hints at it at the beginning when he says the old Echo-2s were known to explode.
I had 3 of these dropped overall. I kept an anointed one of course (because it may come in an anointed version too)
Yup got an anointed one also, easily overlooked as it’s a white, sneaky Gearbox. 
It’s damage is on par with a lot of the legendary grenades.
Late to the party!
Proof you won’t see the same things from player to player.