That girl is subject to scorn by Audiotool's resident Firearms Safety Police (me)
That weapon is based off of the AR-15 Platform, specifically an HK-416/17.
This weapon fires 5.56 , however can take .226 Remington rounds like standard ARs.
Now here is where she is wrong. Luckily it is only a minor mis-step.
Her finger, although not resting on the trigger itself is still resting inside the trigger guard. Not a good habit to build. Rest your finger on the safety instead. Good song tho :)