Abstract: A friction minimizing element such as a smooth hardened ball, a dimple in the sear spring (steel, stainless, plastic, carbon fiber or titanium material) is employed to minimize sliding friction between the spring and the disconnector or between other sliding components of a firearm mechanism, particularly the trigger mechanism of a handgun or other firearm. In addition, the same technology can be applied to the trigger bow of a semi-automatic handgun by placing an additional ball or dimple in the trigger bow that minimizes sliding friction between the rear transverse element of the trigger bow and the disconnector of the trigger mechanism. The benefits of the sear spring or the trigger bow modifications can be applied together or separately in the trigger mechanism. Each adds an individual benefit of minimizing sliding friction between engaging trigger components and thus preventing trigger creep as the trigger mechanism is actuated.

Abstract: A slimbore marine riser and BOP are provided for a subsea completion system which includes a tubing spool secured to a wellhead at the sea floor. The tubing spool has an internal landing profile for a reduced diameter tubing hanger which is arranged and dimensioned to pass through the bore of the riser and BOP at the end of a landing string. The tubing hanger, arranged and designed to be sealingly positioned in the tubing spool landing profile, has a production bore and a relatively large multiplicity of electric and hydraulic passages which terminate at a top end of the hanger with vertically extending electric and hydraulic couplers. A passage is provided through the body of the tubing spool which provides communication from above the tubing hanger to the well annulus below the hanger. A remotely controllable valve is placed in the annulus bypass passage.