Whether someone else (like Jones) used a "screw grip" with an underlever, or someone else used a similar mechanism to attach a forend, it remains a fact that the screw grip associated with top lever guns was patented by Webley and Brain in 1882; made by Webley until the merger with Scott in 1897; and made by Webley and Scott thereafter. They were referred to in at least one Webley & Scott catalog as "Patent Top Screw Treble Grip" guns. Probably easier just to say "screw grip", since that is an accurate description of the mechanism.
