Abstract: A 3-in-1 mount adapter for a firearm having an engagement interface with a plurality of openings includes an attachment base having at least one mounting hole; a mounting plate including at least one ridge receiving through hole aligned with the mounting hole; and at least one fastener assembly including a nut having a ridge passed through the ridge receiving through hole and the openings of said firearm, and a bolt having a threaded portion engaged with the nut and screwed in the mounting hole for affixing the attachment base with the mounting plate; wherein the nut includes a nut head radially extended from the ridge and having an cross sectional area larger than an area of the mounting hole to block the nut head on the mounting plate.

Abstract: A backpack with quick deploying body armor includes a backpack having a front compartment and rear compartment which has an opening on the top of the backpack; the opening can be closed by a flap which has open and closed positions; the flap can be locked to the top of the backpack. A rear ballistic panel is attached to the vertical face of the rear compartment. A front ballistic panel module has two connecting straps connecting to the bottom face of the rear compartment and two pulling straps. The front ballistic panel module has a storage position and deployed position. In the storage to position, the front ballistic panel is in the rear compartment and the pulling straps are attached to the shoulder straps of the backpack. In the deployed position, the front ballistic panel is out of the rear compartment and the pulling strap is fastened to the body of the wearer by connecting the end of the pulling strap.

Abstract: A magazine opener for removing a floor plate of a firearm magazine, wherein the floor plate defines a hole and the magazine defines a side wall, wherein the opener includes: a handle having a first end and a second free end; a first arm pivotally connected with the first end of the handle; a second arm extended from the handle to form an engagement point biased against the side wall; wherein the first arm comprises a L-shaped element inserted into the hole to secure the first arm with the floor plate.

Abstract: A flip up gun sight includes a sight body which includes: a sight housing having a pivotal end; a base member having a right tab and a left tab slidably connected with the pivotal end of the sight housing; a supporting member having a first supporting end pivotally connected with the sight housing, and a second supporting end pivotally connected with the base member; and a locking and folding mechanism which includes a pair of sliding slots formed on the right and left tabs, and a first mounting pin adapted to pivotally connect with the sight housing and sight base member to guide the sight housing for operating between a raised position and a down position.

Abstract: A free float handguard for a firearm having a barrel includes a handguard body and a locking arrangement. The locking arrangement includes a barrel locker and a handguard locker. The barrel locker includes a first tubular locker adapted for coaxially coupling at a fixed end of the barrel, and a second tubular locker coaxially and rotatably coupled at the first tubular locker. The handguard locker has a rear portion coaxially coupled at the first tubular locker to prevent the handguard locker from being rotated therearound, and a front portion engaged with the second tubular locker to prevent the second tubular locker from being rotated around the first tubular locker, wherein a first end portion of the handguard body is coupled at the handguard locker for locking up the handguard body around the barrel in a free float manner.

Abstract: A free float handguard for a firearm having a barrel includes a handguard body and a locking arrangement. The locking arrangement includes a barrel locker and a handguard locker. The barrel locker includes a first tubular locker adapted for coaxially coupling at a fixed end of the barrel, and a second tubular locker coaxially and rotatably coupled at the first tubular locker. The handguard locker has a rear portion coaxially coupled at the first tubular locker to prevent the handguard locker from being rotated therearound, and a front portion engaged with the second tubular locker to prevent the second tubular locker from being rotated around the first tubular locker, wherein a first end portion of the handguard body is coupled at the handguard locker for locking up the handguard body around the barrel in a free float manner.

Abstract: A flip-up aiming sight for a firearm includes a mounting base having a top platform, an illuminator embedded under the platform of the mounting base, and a flip up lens module which includes a lens frame pivotally coupled at a front side of the mounting base and a reflecting lens encirclingly mounted at the lens frame. The flip up lens module is arranged to pivotally fold between a folded position and an unfolded position. At the folded position, the lens frame is rearwardly and downwardly folded flat on the platform of the mounting base, and at the unfolded position, the lens frame is frontwardly and upwardly moved from the platform, such that the illuminator generates an aiming point on the reflecting lens.