Our 6 Shell Buttstock Shotshell Holder (BSH) holds 6 spare 12ga. shotgun shells in loops on the offside of the buttstock. Secure, but readily accessible, this gives the shooter spare a-mmunition that's always with the weapon. A highly valuable feature of this BSH is that it is modular, completely ambidextrous and can be easily attached to the rear adapter of any of our fixed stock shotgun 2 or 3 point slings. NOTE: This item is intended for use on standard fixed stock shotguns. This is a stand alone version that comes with a rear adapter should you not already have a Specter Gear sling attached to your shotgun or are purchasing a BSH for a Benelli M1, M2 or M3. Please note that Specter Gear slings for the Benelli shotguns do not use a wrap around rear adapter. They are attached to the side sling mounting slots on the stock. Therefore, in order to have a mounting point for the BSH, the stand alone version, with it's included rear adapter, is the only option available for Benelli's. Your Specter Gear sling may then be attached to the provided rear adapter, or to it's original stock mounting point.