In the same scene we see the "Ring Trick", the guy inside is blasting away with an unknown assault rifle. These are the only shots ever given:
The star pattern type flash hints maybe an M16 of some sort? Like this one seen in the hands of an ESU agent (not sure it's an Adler Jaer though)
We see 5.56mm blank ammunition on the floor of his apartment, so it's a maybe.
