Saw a nice looking sb2 .223 in a gun shop, used, with a scope rail already installed today. It looked good but was a little loose when broken open. It had a loose feel and even a bit of noise because of the movement, but locked up tight. Is this normal wear or a problem? Just wanting to make sure it will be accurate and reliable. I realize this is hard to describe how loose, but just trying to get some advice. On the plus side the trigger was nice and light. Thanks for any input.