Just got a new K-80 and have a question about the fore arm fit. When closed, the forearm is tight with no movement in anyway. However when the gun is open, there is a very slight movement in the forearm. If I grab the barrels and forearm and squeeze, it's noticeable. Again, this is only when the gun is open, and it is very slight. Thoughts? Is this ok since everything is tight with no movement when it is closed? Gun is brand new, if that helps.