I had a recoil pad put on a 20 ga. Sterlingworth to lengthen the stock. When I picked it up the gunsmith told me that he found a note with a name and tel # under the buttplate. He put it back under the new pad but didn't think to write down the info for me. Someday I will pull the pad and take a look at it. At the time I thought this was somewhat unusual but I guess it is fairly common.