In one example, the disclosure relates to adjustable flip up sight assembly that can be adjusted vertically and laterally in particular, for an automatic firearm, comprising a front sight support element that is supported by an axle on a mount, in particular such that they can pivot thereon, wherein the front sight support element has an adjustment element supported on a spring element and releasably connected to a front sight, which contains a keyhole type opening through which the axle is inserted, wherein the adjustment element can be moved in relation to the axle against the spring force between two positions inside the front sight support element such that the keyhole opening prevents a lateral movement of the front sight support element along the axle when engaged with the axle, and allows the lateral adjustment of the front sight support element in a released position.

In one example, the disclosure relates to adjustable flip up sight assembly that can be adjusted vertically and laterally in particular, for an automatic firearm, comprising a front sight support element that is supported by an axle on a mount, in particular such that they can pivot thereon, wherein the front sight support element has an adjustment element supported on a spring element and releasably connected to a front sight, which contains a keyhole type opening through which the axle is inserted, wherein the adjustment element can be moved in relation to the axle against the spring force between two positions inside the front sight support element such that the keyhole opening prevents a lateral movement of the front sight support element along the axle when engaged with the axle, and allows the lateral adjustment of the front sight support element in a released position.

A sighting system for a firearm and related methods are disclosed. The sighting system has front and rear flip-up sights, wherein the front sight comprises a flip-up portion having an aperture through which a sight post can partially extend; a knob comprising one or more notches on a first side and the sight post extending from a second side; at least one detent arranged to face and interact with the one or more notches. The knob is configured to rotate about a first axis, where the rotation causes the sight post to move in a first direction along the first axis; tilting of the knob in a second direction based on the detent interfacing with the notches; and tilting of the sight post in the second direction, thereby forcing at least a portion of the sight post to press against the aperture, or a combination thereof.

A sighting system for a firearm and related methods are disclosed. The sighting system has front and rear flip-up sights, wherein the front sight comprises a flip-up portion having an aperture through which a sight post can partially extend; a knob comprising one or more notches on a first side and the sight post extending from a second side; at least one detent arranged to face and interact with the one or more notches. The knob is configured to rotate about a first axis, where the rotation causes the sight post to move in a first direction along the first axis; tilting of the knob in a second direction based on the detent interfacing with the notches; and tilting of the sight post in the second direction, thereby forcing at least a portion of the sight post to press against the aperture, or a combination thereof.

In some embodiments, an apparatus comprises a first body and a second body aligned upon an axis. The first body comprises a first sight window and a first side edge, a second side edge and a base edge defining the first sight window, and a first central indicator. The second body comprises a second sight window and a first side edge, a second side edge and a base edge defining the second sight window, and a second central indicator. The axis extends through a center of the first sight window and through a center of the second sight window.

In some embodiments, an apparatus comprises a first body and a second body aligned upon an axis. The first body comprises a first sight window and a first side edge, a second side edge and a base edge defining the first sight window, and a first central indicator. The second body comprises a second sight window and a first side edge, a second side edge and a base edge defining the second sight window, and a second central indicator. The axis extends through a center of the first sight window and through a center of the second sight window.

A handguard exhaust structure of a firearm includes: a barrel, a piston mechanism parallelly arranged with the barrel in a length direction and a positioning end, a sleeve extended from the positioning end, and a piston member actuating within the sleeve, two exhaust holes are respectively disposed at two sides of the sleeve and arranged to be adjacent to the positioning end; and a handguard allowing the barrel and the piston mechanism to be disposed therein, two divergent stoppers are respectively disposed on the handguard at locations corresponding to the two exhaust holes, each of the divergent stoppers is formed along a length direction of the handguard, a lower diverter hole and an upper diverter hole penetrating the handguard are disposed at two sides of each of the divergent stoppers. Accordingly, effects of lowering the temperature and prevent hands from being burnt are achieved.

A handguard exhaust structure of a firearm includes: a barrel, a piston mechanism parallelly arranged with the barrel in a length direction and a positioning end, a sleeve extended from the positioning end, and a piston member actuating within the sleeve, two exhaust holes are respectively disposed at two sides of the sleeve and arranged to be adjacent to the positioning end; and a handguard allowing the barrel and the piston mechanism to be disposed therein, two divergent stoppers are respectively disposed on the handguard at locations corresponding to the two exhaust holes, each of the divergent stoppers is formed along a length direction of the handguard, a lower diverter hole and an upper diverter hole penetrating the handguard are disposed at two sides of each of the divergent stoppers. Accordingly, effects of lowering the temperature and prevent hands from being burnt are achieved.

A sighting system for a firearm and related methods are disclosed. The sighting system has front and rear flip-up sights, wherein the front sight comprises a flip-up portion having an aperture through which a sight post can partially extend; a knob comprising one or more notches on a first side and the sight post extending from a second side; at least one detent arranged to face and interact with the one or more notches. The knob is configured to rotate about a first axis, where the rotation causes the sight post to move in a first direction along the first axis; tilting of the knob in a second direction based on the detent interfacing with the notches; and tilting of the sight post in the second direction, thereby forcing at least a portion of the sight post to press against the aperture, or a combination thereof.

A sighting system for a firearm and related methods are disclosed. The sighting system has front and rear flip-up sights, wherein the front sight comprises a flip-up portion having an aperture through which a sight post can partially extend; a knob comprising one or more notches on a first side and the sight post extending from a second side; at least one detent arranged to face and interact with the one or more notches. The knob is configured to rotate about a first axis, where the rotation causes the sight post to move in a first direction along the first axis; tilting of the knob in a second direction based on the detent interfacing with the notches; and tilting of the sight post in the second direction, thereby forcing at least a portion of the sight post to press against the aperture, or a combination thereof.