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Help with import

Hi everyone.
I need help with my model. I have desided to move tf2 sniper from tf2 to UE just to make some fun. Made new rig, configured textures, ext. But I can’t make fine control rig for him. Something is wrong with his arms and Basic IK is doing strange things with them. I can’t understand, why he is doing this. Can someone give a clue?
Model: