Abstract: A firearm receiver cover and closure assembly that allows the cover to be moved between respective open and closed positions relative to an underlying receiver. The closure assembly includes a latch that defines a latch button that cooperates with a latch button opening formed in the cover. Cooperation of the latch with the receiver and the cooperation of the latch button with the latch opening formed in the cover provide fixed and repeatable vertical and lateral positioning of the cover relative to the underlying receiver, without adjustment or operation of a centering mechanism or structure, during each closing of the cover relative to the underlying receiver.

Abstract: A mount assembly for securing accessories to an underlying firearm assembly. The mount assembly includes a base that is constructed to be secured to an underlying firearm and an accessory support that is moveable relative to the base. An interface arrangement is provided between the base and the accessory support such that the accessory support can be rotated relative to the base between a first orientation that is laterally inboard of the base and a second orientation that is laterally outboard of the base to accommodate break-action operation of an underlying firearm when the accessory mount assembly is secured to the firearm.

Abstract: A system or assembly for securing accessories to an underlying firearm assembly. The accessory mounting assembly includes a base that is constructed to be secured to a mount plate that is securable to an underlying firearm. An accessory support is securable to the base and moveable in a horizontal lateral direction relative thereto. An engagement or interface arrangement is provided between the base and the accessory support such that the accessory support can be translated in a lateral direction that is orthogonal to a bore of the underlying firearm and is constructed to provide vertical association of discrete accessory supports relative to the base.