Here goes. It's a bit ambiguous if it's an M4 or just an AR-15 that has the same barrel length as one.

Rifle: FDE Cerakoted AR-15 or M4.
Handguard: Magpul MOE (Carbine Length)
Foregrip: Magpul AFG1 (Strange proportions.)
Pistol Grip: Magpul MOE or MIAD
Stock: Magpul CTR
Optic: EOTech XPS2

Can't really judge what that pistol grip would be. Bottom of MIAD didn't looked like that as far as I know.