POTD: A scope mount is born

    Have you ever wondered how a scope mount is made?

    That is the story behind Today’s Photo of the Day.

    In the pictures you can see a “before” and “after”.

    You start with a block of aluminum, of alloy 7075 T651. Obviously this is the lump of metal to the left in the picture. This block of metal you then CNC machine according to your CAD drawings, and after the machining is done you have the part to the right.

    According to Wikipedia: “T651 temper 7075 has an ultimate tensile strength of 570 MPa (83,000 psi) and yield strength of 500 MPa (73,000 psi). It has a failure elongation of 3–9%.”

    A mount CNC machined out of a single piece of metal makes a very robust construction.


    After machining there are a few down-the-line processes awaiting, for instance several quality checks as well as various types of anodizing. surface finishing or painting depending on the customer’s needs.

    For instance, some Armies don’t want their rifle scopes or firearms to be black, as black does not naturally occur in nature.

    The end product is one of Spuhr’s ISMS (Ideal Scope Mount System), but the process would be the same or similar for most if not all scope mount makers.

    TFB recently visited the brand new Spuhr factory in Sweden, and we will return with an in-depth story.