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Thanks for your opinions!
@biologik: on the left side as well?
Ok… maybe the pic is not that good, but faceplate bows nearly 1 mm the highest. Looks like the AR fell down somewhen or so… Made a new pic.
@bkinsman: Lol, true 
@avatronica: It seems, that pads are not mounted against the faceplate; if I press fairly hard, the gap is not moving. If pressing the faceplate, it moves easily.
Thanks in advance for your comments, if you experience the same.