Joints are perfectly tight and any pose is possible, it appears to not have been played with. Please examine the pictures carefully. There is no damage that I can find.
This is a rare and special Japanese-only 1985 Megatron variant in amazing condition.
With a functional trigger mechanism and unique mold details (no stock attachment point on the back of the legs/grip) this is a great item for collectors. This variant never had the black fusion cannon or associated parts.