Hey, hi! Local gun nerd here to post some observations about the rifle for anyone interested.
The girl's rocking a .300 Blackout AR-15 with what I can guess to be a 12.5" barrel on a pistol length gas system.
Starting from front to back, the muzzle device appears to be a BCM Gunfighter Compensator MOD 1.
The handguard is a BCM MCMR-10 with an AN/PEQ-15 laser at the 12 o'clock, an unidentifiable flashlight at the 3 o'clock, and what appears to be an Arisaka Defense vertical grip at the 6 o'clock positions. A little bit further down is what appears to be a single Modlite ModButton Lite (probably a dual lead) followed by a BCM QD sling mount.
Moving onto the receiver itself, the optic on top is a Gen 2 Vortex UH-1 mounted onto a Unity FAST mount. The bolt catch has been replaced with a Magpul B.A.D. Lever, and the magazine's a Magpul Gen M3 PMag. I'm not particularly sure about the charging handle really, but I can probably guess it's a Raptor. The safety appears to be a Radian Talon (which is sitting between the Safe and Semi/Fire settings for some reason), and the pistol grip is a BCM Gunfighter MOD 3.
The trigger and trigger guard are definitely not mil-spec, but I wouldn't be surprised if it's BCM along with the upper receiver, bolt carrier group, buffer, and spring given the abundance of BCM parts I've been able to identify.
To finish this off, the stock is a BCM Gunfighter Stock MOD 0 fitted to a LAW Tactical folding stock adapter.
If I've made any mistakes or missed anything, feel free to correct me.
Edit: I did a little bit more research and found that the Radian Talon can be installed as a 45 degree short throw selector. Neat.
