Tactical End Cap With Detachable Push Button Sling Swivel For the Mossberg 500 590 Maverick 88 Open Grip. This high quality aircraft grade aluminum end cap screws into the Mossberg 500/535/590/Maverick 88 12 & 20 ga pistol grip that has the opening in the back to mount an optional adjustable stock. Want to run your shotgun with a more compact look? Simply screw the end cap into the grip and you are good to go. The sling swivel detaches with the simple push of a button, and allows you to attach a variety of tactical slings.* Please note: This cap combo only works with grips that haven an open back end that is threaded to accept a stock tube. * Pistol Grip Featured In the Listing Photos Is For Illustrative Purposes ONLY. This Listing Does Not Include A Grip* Features: * Aircraft Grade T-6061 aluminum * Black anodized finish * Detachable push button sling swivel * Stock/Spanner Wrench/1911 Barrel Bushing Wrench Combo!