Abstract: A firearm accessory mounted to a firearm accessory rail and allowing adjustment of the accessory relative to the firearm accessory rail includes an indexing member having a tab structured to engage with one of the series of slots of the firearm accessory rail, and having two or more indexing slots, the two or more indexing slots spaced apart from one another at a distance less than the regular pitch interval of the accessory rail, and a single clamp having a crossmember structured to engage with one of the two or more indexing slots, the single clamp structured to simultaneously secure the accessory and the indexing member to the firearm accessory rail in a single clamping action.

Abstract: An accessory mounting system for adjustably mounting an accessory to a firearm accessory rail having a series of slots includes a rail clamping system structured to clamp to the firearm accessory rail, a mounting member having a tab structured to engage with one of the series of slots of the firearm accessory rail; and an adjustment mechanism that allows the accessory to be moved along a long axis of the firearm accessory rail less than a slot pitch of the firearm accessory rail.

Abstract: An accessory mounting system for adjustably mounting an accessory to a firearm accessory rail having a series of slots includes a rail clamping system structured to clamp to the firearm accessory rail, a mounting member having a tab structured to engage with one of the series of slots of the firearm accessory rail; and an adjustment mechanism that allows the accessory to be moved along a long axis of the firearm accessory rail less than a slot pitch of the firearm accessory rail.

Abstract: A brush seal includes a mounting ring that carries radially inwardly directed bristles. A backing member attached to the mounting ring is positioned alongside the bristles. A chamber defined by the bristles and the backing member is pressurized with fluid to counteract the lateral forces imposed upon the bristles by a region of high fluid pressure that they are operationally adjacent. As a result of this balancing of forces, the bristles are free to move radially inward and outward so that their free ends remain in sealing engagement with an adjacent surface.

Abstract: A brush seal element (14) comprises a mounting ring (20) that carries radially inwardly directed bristles (21). A backing ring (23) attached to the mounting ring (20) is positioned alongside the bristles (21). A chamber (25) defined by the bristles (21) and the backing ring (23) is pressurised with fluid to counteract the lateral forces imposed upon the bristles (21) by a region of high fluid pressure that they are operationally adjacent. As a result of this balancing of forces the bristles (21) are free to move radially inward and outward so that their free ends (22) remain in sealing engagement with an adjacent surface.