I remember it being this, or something from the same timeperiod, where a bunch of teenagers played lasergame, but when there was a threat in a universe (or something), they shoot at mirrors, the laser hit them, and they were transported and transformed into heroes...
I vaguely remember a metal bird-like creature who could devour people by sucking them in or something, gave me the creeps...
---
I used to love her, but I had to kill her. - GNR
correct, this was the show
you can find all 22 episodes online, also check youtube for this show
Sounds like you are mixing up a few shows. The teenagers playing a lightgun game was Laser Tag. The metal bird was Captain Power. Battling a threat in the universe was Photon.
In Laser Tag they were chasing a criminal into the past. The guns acted alot like a Green Lantern ring in that they could do all sorts of power effects and activated it by zapping a mirror if I recall correctly. It was a standard animated series.
Photon was a live action series based also on a lightgun game/arena. It had a earth teen recruited into an interstellar force to combat a universal corrupting force.