Abstract: A device implementable on a firearm includes a rotation mount comprising a first main piece and a second main piece. The first main piece has a first mounting side configured to accommodate mounting of optics and accessories thereon. The second main piece has a second mounting side configured to accommodate a mounting surface on the firearm such that the rotation mount is installable on the firearm via the second main piece. The first main piece is configured with a first coupling portion with a generally cone-shaped first feature. The second main piece is configured with a second coupling portion with a generally cone-shaped second feature configured to mate with the first feature of the first coupling portion such that the first main piece is pivotable around a rotation axis of the rotation mount when the first main piece and the second main piece are pivotably joined together.

Abstract: A height-adjustable optics mount includes a lower base attachable to the firearm including an angled platform having a plurality of male guiding teeth and located on the lower base; and an upper base which is operable between a slidable position where the upper base is sliding along the plurality of the male guiding teeth and a static position where the upper base is affixed on at least one of the plurality of male guiding teeth.

Abstract: A foldable sight implementable on a firearm includes a base, a hinge and a sight body. The base is configured to be mounted on a portion of the firearm. The sight body is pivotably attached to the base by the hinge and contains a position holding device therein. The position holding device is configured to hold the sight body at either a first position or a second position responsive to the sight body being rotated from one of the first and second positions to another of the first and second positions.

Abstract: A complementary current-steering digital-to-analog converter (DAC) including a p-type DAC as well as an n-type DAC is shown. The p-type DAC has p-type current sources, and the n-type DAC has n-type current sources. The p-type and n-type current sources are coupled to a first input terminal or a second input terminal of a transimpedance amplifier (TIA) according to the digital input of the complementary current-steering DAC. In response to the digital input changing from a first value to a second value that is greater than the first value, one or more n-type current sources connected to the second input terminal of the TIA are switched so that they are connected to the first input terminal of the TIA.

Abstract: A circuit with a pseudo class-AB structure is shown. The circuit has an output stage, a first capacitor, and a first impedance component. The output stage has a first PMOS (p-type Metal-Oxide-Semiconductor Field-Effect Transistor) and a first NMOS (n-type MOSFET). The first connection node between the drain terminal of the first PMOS and the drain terminal of the first NMOS is coupled to the first output terminal of the circuit. The first capacitor is coupled between the gate terminal of the first PMOS and the gate terminal of the first NMOS. The first impedance component is coupled in parallel with the first capacitor between the gate terminal of the first PMOS and the gate terminal of the first NMOS.

Abstract: A foldable sight implementable on a firearm includes a base, a hinge and a sight body. The base is configured to be mounted on a portion of the firearm. The sight body is pivotably attached to the base by the hinge and contains a position holding device therein. The position holding device is configured to hold the sight body at either a first position or a second position responsive to the sight body being rotated from one of the first and second positions to another of the first and second positions.

Abstract: A device implementable on a firearm includes a monolithic upper receiver, comprising an upper receiver portion and a handguard portion, which is configured to accommodate non-proprietary barrel assemblies dimensioned according to United States military standard (mil-spec) barrel assembly dimensions and non-proprietary bolt carrier groups (BCGs) dimensioned according to mil-spec BCG dimensions. The device also includes a charging handle assembly configured to be coupled to an operating rod of a gas system of the firearm and forward of a BCG of the firearm. The device further includes a barrel locking system including a locking plate and a locking screw. When the locking screw is screwed into a threaded hole on the locking plate, the locking plate engages with a side of a barrel extension of the barrel assembly in a radial directions perpendicular to a longitudinal axis of the barrel assembly.

Abstract: A firearm muzzle attachment mechanism includes a muzzle device; a tapering adapter having an outer tapering end configured to connect with the muzzle device; a hollow adapter having an internally threaded portion and configured to receive the muzzle device; a muzzle attachment having an inner tapering end configured to connect with the outer tapering end of the tapering adapter; and a means for providing tension being received in a receiving slot formed on the muzzle attachment.

Abstract: A firearm launcher for holding a projectile includes a launcher body attached to a firearm barrel; and a tension member cooperated with the launcher body. In one embodiment, the tension member is connected with the projectile.

Abstract: A firearm muzzle attachment mechanism includes a muzzle device; a tapering adapter having an outer tapering end configured to connect with the muzzle device; a hollow adapter having an internally threaded portion and configured to receive the muzzle device; a muzzle attachment having an inner tapering end configured to connect with the outer tapering end of the tapering adapter; and a means for providing tension being received in a receiving slot formed on the muzzle attachment.

Abstract: A height-adjustable optics mount includes a lower base attachable to the firearm including an angled platform having a plurality of male guiding teeth and located on the lower base; and an upper base which is operable between a slidable position where the upper base is sliding along the plurality of the male guiding teeth and a static position where the upper base is affixed on at least one of the plurality of male guiding teeth.

Abstract: A device implementable on a firearm includes a monolithic upper receiver, comprising an upper receiver portion and a handguard portion, which is configured to accommodate non-proprietary barrel assemblies dimensioned according to United States military standard (mil-spec) barrel assembly dimensions and non-proprietary bolt carrier groups (BCGs) dimensioned according to mil-spec BCG dimensions. The device also includes a charging handle assembly configured to be coupled to an operating rod of a gas system of the firearm and forward of a BCG of the firearm. The device further includes a barrel locking system including a locking plate and a locking screw. When the locking screw is screwed into a threaded hole on the locking plate, the locking plate engages with a side of a barrel extension of the barrel assembly in a radial directions perpendicular to a longitudinal axis of the barrel assembly.

Abstract: A device implementable on a firearm includes a monolithic upper receiver, comprising an upper receiver portion and a handguard portion, which is configured to accommodate non-proprietary barrel assemblies dimensioned according to United States military standard (mil-spec) barrel assembly dimensions and non-proprietary bolt carrier groups (BCGs) dimensioned according to mil-spec BCG dimensions. The device also includes a charging handle assembly configured to be coupled to an operating rod of a gas system of the firearm and forward of a BCG of the firearm. The device further includes a barrel locking system including a locking plate and a locking screw. When the locking screw is screwed into a threaded hole on the locking plate, the locking plate engages with a side of a barrel extension of the barrel assembly in a radial directions perpendicular to a longitudinal axis of the barrel assembly.

Abstract: In one aspect, a bi-directional foldable stock for a firearm may include a stock-to-firearm adaptor configured to be an interface to connect the firearm and the stock. The adaptor may include a base and a movable top portion that is pivotally and detachably engaged with the base. The top portion is attached to the firearm while the base is connected to the stock. The base with the stock is configured to pivotally rotate either in a clockwise or counter-clockwise manner to fold the stock on either sides of the firearm.

Abstract: A device implementable on a firearm includes a monolithic upper receiver, comprising an upper receiver portion and a handguard portion, which is configured to accommodate non-proprietary barrel assemblies dimensioned according to United States military standard (mil-spec) barrel assembly dimensions and non-proprietary bolt carrier groups (BCGs) dimensioned according to mil-spec BCG dimensions. The device also includes a charging handle assembly configured to be coupled to an operating rod of a gas system of the firearm and forward of a BCG of the firearm. The device further includes a barrel locking system including a locking plate and a locking screw. When the locking screw is screwed into a threaded hole on the locking plate, the locking plate engages with a side of a barrel extension of the barrel assembly in a radial directions perpendicular to a longitudinal axis of the barrel assembly.

Abstract: In one aspect, a bi-directional foldable stock for a firearm may include a stock-to-firearm adaptor configured to be an interface to connect the firearm and the stock. The adaptor may include a base and a movable top portion that is pivotally and detachably engaged with the base. The top portion is attached to the firearm while the base is connected to the stock. The base with the stock is configured to pivotally rotate either in a clockwise or counter-clockwise manner to fold the stock on either sides of the firearm.

Abstract: In one aspect, a bi-directional foldable stock for a firearm may include a stock-to-firearm adaptor configured to be an interface to connect the firearm and the stock. The adaptor may include a base and a movable top portion that is pivotally and detachably engaged with the base. The top portion is attached to the firearm while the base is connected to the stock. The base with the stock is configured to pivotally rotate either in a clockwise or counter-clockwise manner to fold the stock on either sides of the firearm.

Abstract: Serially connected low voltage transistors are used to replace a high voltage transistor in a voltage conversion circuit for a driver, or parallel connected sub-transistors are used to establish a high voltage transistor having an effective size dynamically adjusted according to loading of the driver, to reduce switching loss and thereby improve the efficiency of the driver.

Abstract: Serially connected low voltage transistors are used to replace a high voltage transistor in a voltage conversion circuit for a driver, or parallel connected sub-transistors are used to establish a high voltage transistor having an effective size dynamically adjusted according to loading of the driver, to reduce switching loss and thereby improve the efficiency of the driver.