ThisBattle Steel Front Loop Sling Mount for the Mossberg 500/590 12 Gauge Shotgun is an ideal sling mounting solution that is reversible for right or left hand use and compatible with HK-style Clips or Mash Hooks. The sling mount adapter attaches behind the magazine tube end cap and is secured in place with a ball bearing detent. Easy, no tools required installation The Mossberg 590 Quick Clip Front Sling Attachment accommodates slings with MASH or HK style hooks. Stainless steel ball bearing detent to secure the unit behind the end cap of the magazine tube. Smooth edges for shooters safety and accessories integrity.