The amazing thing is we haven’t gotten any information on where she got her guns. We usually hear about that quickly.
Purchased legally by a 28 year old woman with background checks. One looks like a Keltec Sub2000 9mm with a Glock magazine (I have one like it). The other looks like a common AR-15 in .223 (although that is a guess on the caliber). The pistol is a S&W M&P 9mm EZ (I have one like it as well). The magazine in the Sub2000 looks long enough to be a PMAG Glock mag with a 44 round capacity.
She shot out the glass doors to gain entry into the building. They may have been locked, but clearly not bullet proof.
In the videos, the Sub2000 was just dangling from a sling. The AR-15 was her active weapon.
Here in Nashville, we know she bought them at a gun store