If your Mossberg 500 shotgun has a removable magazine tube end cap that is not attached to the barrel” you need to purchase one of the GG&G Sling Attachments manufactured for the Mossberg 590 versus one for the Mossberg 500. The Mossberg factory for an unknown reason installed 590 parts on some 500’s.
GG&G, Inc. Front Sling Attachment, Sling Mount, Fits Mossberg 500, Black Finish GGG-1468
