The "assault rifle" was originally reported as found in the BACKSEAT of the vehicle was identified as a BushMaster immediately.

Interesting that it was called out by name.

The weapon in the trunk appears to be a Saiga shotgun....not much doubt.

Anyway how do the first responders identify a Glock and a Sig Sauer, by name, as the weapons used inside the school?

These same first responders to the actual location inside the school, including police and firefighters, should be able to tell the difference handguns and a Bushmaster "assault rifle"