It’s and krytac trident with all 3 uppers I switched out the aeg with a polarstar jack I forget the fcu in it but it dose have one!!! It has a redline mini regulator and a 3000 psi tank you can literally switch the top and crank the reg for any play style from cqb all the way to a dmr build. It’s a great gun in great condition I’m only selling it because I leave for the marines in 2 months and I want someone else to have fun with it