Go in the mission editor, place the mig, top view, scroll the view up, at a point the wing will surely disappear.
Quoting my bugtracker note :
E: Here's a gif
I should have the most up to date version of DCS, 2.5.0.14044
I've noticed while playing with a friend that on distance the MiG was missing a wing, but I had the Rift, so I wasn't sure.
Now I watched a video from the 2.5 and the MiG does miss a wing! I went to check the files and I think it is the "mig21_lod4.edm" which misses a wing.
E: Done a bug report on the bugtracker
I deserve it because I would like to have a better position for my arm since the joystick is in my right and i have to move left arm to the right side to use the throttle.
And I like free stuff