Abstract: The present invention is a gas block for use with a firearm that includes a tab covering the set screws and held in place by a pin that runs through the gas block body. The gas block body includes a slot around each set screw hole that allows the tab to be inserted into the gas block body. The tab provides several benefits over traditional gas block designs, including preventing the set screws from shifting or rotating during firing and allowing for easy installation and removal of the gas block without the need for specialized tools. The gas block is easily installed and removed, and the tab provides a secure and stable attachment point for the gas block. This gas block is an improvement in the field of rifle technology and is expected to find use in the firearms industry.

Abstract: A bolt-tightened type coupling includes a pair of semi-circular arc-shaped coupling halves having base ends which are pivotably connected to one another, so that the coupling halves can be moved toward each other to a closed position and moved away from each other to an open position. The coupling halves have opposite, free ends providing with flanges, respectively, having bolt inserting holes, respectively. One of the bolt inserting holes has such a shape that a bolt fits tightly with the inner edges of the bolt inserting hole, so that the bolt can be held by the bolt inserting hole.

Abstract: A retainer (76) is disclosed for retaining a first element to a second element. Various construction details are developed which provide means to secure a second element to a first element wherein the elements are highly stressed, such as the rotating components of a turbomachine. In one particular embodiment, the retainer has a deformable portion (86) on one end, an internally threaded portion (88), and a shoulder (84) disposed on the end opposite the deformable portion and having a flat surface (92) to prevent rotation of the retainer during assembly. The deformable portion extends through cooperating retainer apertures (52, 68) in the two elements. The deformable portion is flared in place to produce a clinching force between the deformable portion and the shoulder and thereby secure the two elements together.