Abstract: The blast deflector may be used with a barrel and with a firearm. The blast deflector threads onto the end of a barrel of the type that has an outer tube and an inner tube defining a chamber thereinbetween. The blast deflector provides for a sealing connection between the outer tube and the inner tube. The blast deflector has a plurality of channels radially spaced around a central passage. Each of the channels is sized to define an axially aligned member that extends inwardly but is spaced away from the central passage to define a receiving chamber. The receiving chamber has length of about 2 to about 4 times the diameter of the projectile. The propellant gases enter the receiving chamber and are directed out through the transverse channels rearwardly which are formed at an angle of about 60.degree. relative to the axis of the central passage.

Abstract: A device is provided for cleaning a surface by introducing a highly reactive gas mixture to the surface. The highly reactive gas mixture may include excited species such as ozone and relate excited ions, atoms, and electrons. The excited gas mixture then oxidizes undesirable materials on the surface. The device includes a structure which defines an enclosed space when placed against the surface to be cleaned. A set of one or more electrodes are positioned within the device such that an electrical discharge across the electrodes excites the selected gases species. The electrodes are attached to a power supply capable of generating a high frequency, high voltage discharge. A tube is provided for transporting selected gases, such as air or oxygen, to the enclosed space. Another tube is provide for removing reaction products from the enclosed space. This tube is place in communication with a source of suction for establishing a flow of gases into and out of the enclosed space.