GG&G, Inc. Rear Sling Attachment Mount, Fits Moss 500/590, Quick Detach, with Heavy Duty QD Swivel, Black Finish GGG-1429 The Mossberg 590 Shotgun is one of the most popular Mossberg shotguns in the marketplace. Not every shotgunner likes to use slings outfitted with the HK style quick clip or mash hook" yet they would still like to have the tactical flexibility that a quick detach sling provides. GG&G has developed a solution for those shooters; The Mossberg 590 Quick Detach Rear Sling Attachments. Rear attachments are easy to install" feature limited sling swivel rotation. If you are an avid Mossberg 590 shooter" we know you'll like these 590 QD Sling attachments.