Mesa Tactical offers a on-gun shell-holder solution for Remington 870 pump shotguns. The Receiver Mount Shell Holder is a variant of Mesa Tactica's aluminum on-gun shell holder soltuion, but which can be secured directly to any Remington 870 shotgun. Machined from 6061-T6 hard anodized aircraft aluminum, the shell holders incorporate an entirely new internal elastomer shell retention system that eliminaes the need for the flexible plastic shell retainers used on conventional shell holders. An arrangement of threaded fasteners secures the shell holder to the shotgun receiver wihout the risk of stripping threads in the aluminum bracket.