I'd say that is a standard G36 with new textured grip as found on the HK243. It has a FA bolt carrier installed and not the new type of bolt carrier as found on the HK243.
I'd go with what is shown on the above link and say it's a G36V with the IDZ upgrades; aluminum optic rail, new convex IDZ stock, extended bolt release, extended ambi-mag release, M-Lok Forearm, and lack of clamp-together features on the mag (that everyone has been bitching about for not being friendly to magazine pouches)... Am I close?