Thar ga gun

I saw a thar ga with guns that i cant find, there r more gun that you can see ?

The only gun you cannot see from the equipment list is the Turbophaser which is a reward for e-sports events/minor tournaments

Its a green beem very fast shot gun with too much damage and long distance
? Because i saw one player with that kind who need 3 sec to kill any target.

That would be a heavily seed chipped “Thi’lith beam” then if it looked like a lightning bolt instead of a projectile.