A reinforced concrete element comprises a first lattice girder having a triangular profile, and a second lattice girder having a triangular profile, the second lattice girder having a size smaller than a size of the first lattice girder. The first lattice girder includes at least one triangular cavity. A section of the second lattice girder is positioned through the triangular cavity so that the second lattice girder is transverse to the first lattice girder. The positioning of the second lattice girder through the triangular cavity of the first lattice girder forms a lattice girder matrix that is designed to provide support and reinforcement to a concrete matrix in an x-axis, a y-axis, a z-axis, and one or more additional directions and/or axes. The reinforced concrete element is resistant to high explosive blast effects and/or impacts from kinetic energy projectiles.
E04C 5/065 - Light-weight girders, e.g. with precast parts
E04B 1/04 - Structures consisting primarily of load-supporting, block-shaped or slab-shaped elements the elements consisting of concrete, e.g. reinforced concrete, or other stone-like material
A gun barrel that has a proximal chamber end, a distal muzzle end, and an internal bore bounded by a bore wall where the internal bore has a cartridge chamber at the proximal chamber end of the barrel, a first rifled bore section distal to the cartridge chamber, a second rifled bore section at the distal muzzle end of the barrel, and a reducing section distal to the first rifled bore section and connecting the first rifled bore section and the second rifled bore section.
A gun sight system including a front sight portion (17) and a rear sight portion. The rear sight portion comprises a circular cylinder (10) sided and formed by incomplete triangles (16a, 16b) pointing to the circular cylinder (10) from each side. In some embodiments, the front sight portion comprises a non-hollow circular cylinder. When the front sight circle (71) is aligned horizontally and vertically to the center of the rear sight (10), an image of two circles is formed for the user and a target is placed to the center of the point of the circle of the front sight.
A detachable folding stock (10) includes folding body sections (31, 32) and a folding butt (40) that can be folded and assumes its operational orientation in either the extended or the folded positions of the stock. The detachable folding stock (10) is removably mountable to a pistol (50), which is mounted thereon by means of a locking pistol frame stock rim to a pistol grip lock well (20), for instance using a catching locker (22). The detachable folding stock includes the lock well, which is attached to the body and into which the pistol grip fits in. The detachable folding stock can assume its operational position in a magazine change operation without interrupting the pistol grip lock well during a magazine change operation.
The present invention is an improved.30 caliber cartridge that overcomes the limitations of the prior art by providing a centerfire cartridge with a case having a head with a rim, a body extending from the head to a tapered shoulder to a mouth that seats a bullet. The cartridge having a dimension that is short enough to fit in an automatic pistol's magazine and when fired from such a pistol's barrel will achieve ballistics closely resembling that of a rifle carbine.
The present invention relates to firearms, especially to guns, and more particularly to a system for attenuating recoil, reducing muzzle climb and increasing accuracy. The invention provides a recoil attenuating mechanism that is an improvement on the well-known and widely used Browning tilting barrel system which is commonly used in semi-automatic pistols. The recoil attenuation is achieved by redirecting and manipulating the forces of the recoil of the slide of the pistol to a different axis than what is the norm on a regular browning action, and thus reducing muzzle climb substantially in addition to attenuating recoil, and therefore improving accuracy, recovery time, and controllability. In particular the recoiling mass (42) is located below the axis (43) of the center of the mass (41) of the pistol.
F41A 5/10 - Mechanisms or systems operated by propellant charge energy for automatically opening the lock recoil-operated having a movable inertia weight
F41A 27/30 - Stabilisation or compensation systems, e.g. compensating for barrel weight or wind force
F41C 27/22 - Balancing or stabilising arrangements
F41A 3/86 - Coil spring buffers mounted under the barrel
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