Uncle Mike's Buttstock Shell Holder Kodra Black Shotgun Open Style Card. The heavy-duty Uncle Mike's Buttstock Neoprene Shell Holder stretches over gun stock and requires no gunsmithing of any kind. For a great way to keep your ammo close choose the Uncle Mike's Neoprene Shell Holder for Buttstocks. Specifications for Uncle Mike's Buttstock Shell Holder: Manufacturer: Uncle Mike's Color: Black Hand: Ambidextrous Condition: New Quantity: 1 Features of Uncle Mike's Neoprene Shell Holder for Weapon Buttstocks: Heavy-duty Neoprene sleeve stretches over gun stock Sewn-on elastic loops secure ammo Package Contents: Uncle Mike's Buttstock Shell Holder Uncle Mike's 88491: Buttstock Shell Holder Kodra Black Shotgun Open Style Card