I purchased a SAS 7 from a friend and looks perfect except for small marks on the very bottom right hand side of receiver. The marks look like very small cuts in the receiver but marks weren't made from a sharp object. The indentations are mostly round. The marks are hard to describe but my friend said the marks were on the rifle when he purchased it new. I have three other milled Arsenals and none have these marks. Has anyone else experienced this type of flaw in the receiver. Sorry for the long description and question.