Nice video, of a pretty gal, taking apart and putting back together a TEC-9. Too bad there are no audio instructions to explain each step as she goes along. Of course, some of the guys who see this will not give a hoot about whether or not there were audio instructions!
Being the critical type that am I, allow me to point something out. In general, if you are going to field strip and reassemble a weapon for cleaning, or other purposes such as making a video, it probably is best done with the bullets removed from the magazine, and left nowhere near the firearm, to avoid an unintentional discharge. Note, somewhere in there, someone placed an empty magazine on the table because the one she puts into the gun at the end of the video appears to be unloaded; although, when she started to assemble it, the live mag was still on the table. I also recommend removing the magazine from the weapon with your finger off of the trigger, and outside the trigger guard, if possible.
All the best,
Butterfly and the Red Bird of Paradise
2 hours ago