It's a G36, no doubt. It has the standard G36 stock, the look is deceiving due to another weapon behind it. You can clearly see the magazine slot and the handguard which are unmistakebly G36 style and would be impossible to attach to a MG4.
If it is a LMG36 remains unclear, as a bipod can be attached to any standard issue G36 and the LMG36 just has a thicker barrel, which can neither be confirmed nor excluded in this pic.
If it is a LMG36 remains unclear, as a bipod can be attached to any standard issue G36 and the LMG36 just has a thicker barrel, which can neither be confirmed nor excluded in this pic.