The usual cause of excessive tightness on this type of gun is that the forend is too tight against the frame.(very common with Citoris) To test this, remove the forend and open the gun. If it opens easily with the forend removed, removing a little metal from the rear of the forend lug. Try a little at a time and quit when it feels to suit you. I don't think waiting to break it in is a good idea. We might not live long enough and/or the forend iron or the frame might actually gall, from being so tight.
