Abstract: A method of firing a firearm includes rotating a trigger to force a latch pin lever to move; forcing a latch pin forward by the latch pin lever to force a cylinder forward toward a barrel; sealing or substantially sealing the barrel and the cylinder; and releasing a hammer to strike a cartridge while the barrel and the cylinder are sealed.

Abstract: A reflective gun sight includes a rear sight including a light source; and a front sight including a reflective surface that is directly opposing the light source and recessed within an aperture of a front sight housing, wherein light emitted from the light source travels through the aperture and is reflected by the reflective surface toward the rear sight.

Abstract: A blank firing system for a firearm includes a barrel configured to mount to the firearm and having a smooth bore at least a portion of a length of the barrel; a blank firing adapter plus bullet trap configured to attach to the barrel; and a magazine configured to accept a stack of blank rounds and up to two live rounds.

Abstract: A reflective gun sight includes a rear sight including a light source; and a front sight including a reflective surface that is directly opposing the light source and recessed within an aperture of a front sight housing, wherein light emitted from the light source travels through the aperture and is reflected by the reflective surface toward the rear sight.

Abstract: A firearm includes a rail; a mount attached to the rail; a lens attached to and rotatable with respect to the mount; a light source that reflects a light off a reflective surface of the lens to aim the firearm; a hood rotatably mounted and in contact with the lens, wherein the hood folds over the lens in a collapsed configuration and is angled from the lens in a deployed configuration, and the hood and the lens each pivot on respective axes that are parallel to each other.

Abstract: A pistol, incudes a slide; a lens attached to and rotatable with respect to the slide; a light source that reflects a light off a reflective surface of the lens to aim the pistol; a hood rotatably mounted and in contact with the lens, wherein the hood folds over the lens in a collapsed configuration and is angled from the lens in a deployed configuration, and the lens, the light source, and the hood fit within an outline profile of the slide in the collapsed configuration.

Abstract: A noise suppression device for a firearm, the noise suppression device including a body including an outermost external surface of the noise suppression device, and an internal surface; a raised strip protruding from the outermost external surface of the noise suppression device; and a plurality of fins extending from the raised strip and spaced apart from each other at intervals along a length of the raised strip, wherein the noise suppression device includes no joints, no seams, or any formerly separate pieces within the body or the core.

Abstract: A method of firing a firearm includes compressing a main spring to rotate a latch pin lever; forcing a latch pin forward by the latch pin lever to force a cylinder forward toward a barrel; sealing or substantially sealing the barrel and the cylinder; and releasing a hammer to strike a cartridge while the barrel and the cylinder are sealed.

Abstract: A reflective gun sight includes a rear sight including a light source; and a front sight including a reflective surface that is directly opposing the light source and recessed within an aperture of a front sight housing, wherein light emitted from the light source travels through the aperture and is reflected by the reflective surface toward the rear sight.

Abstract: A pistol, incudes a slide; a lens attached to and rotatable with respect to the slide; a light source that reflects a light off a reflective surface of the lens to aim the pistol; a hood rotatably mounted and in contact with the lens, wherein the hood folds over the lens in a collapsed configuration and is angled from the lens in a deployed configuration, and the lens, the light source, and the hood fit within an outline profile of the slide in the collapsed configuration.

Abstract: A noise suppression device includes a body including an outermost external surface of the noise suppression device, an internal portion, a first end, and a second end; a core seamlessly connected to the internal portion of the body; and a bore extending completely through and along a longitudinal axis of the noise suppression device, wherein the noise suppression device includes no joints, no seams, and no formerly separate pieces within the body or the core, a porosity of the core at the internal portion of the body is different than a porosity of a portion of the core along a radial direction closer to the bore, where the porosity is defined as a fraction of a volume of pores per volume of mass in a material of the noise suppression device.

Abstract: A reflective sight for use with a firearm includes a rear sight including a light source; and a front sight including a reflective surface directly opposing the light source, where light emitted from the light source is reflected by the reflective surface toward the rear sight. The rear sight can include a plurality of light sources and at least two of the plurality of light sources emit different colors of light.

Abstract: A collapsible sight for a firearm, including a lens attached to and rotatable with respect to the firearm, a light source that reflects a light off a reflective surface of the lens to aim the firearm, a one-piece hood rotatably mounted and in continuous contact with the lens and including an opening in which the light that is reflected off the reflective surface is viewed to aim the firearm, wherein the hood folds over the lens in a collapsed configuration and is angled from the lens in a deployed configuration.

Abstract: A firing mechanism for a firearm includes a trigger, a forcing structure, and a spring within a cylinder, wherein while the trigger is pulled, the forcing structure moves to force the cylinder to contact a barrel and to force the spring to compress, and while the trigger is returned to an idle position, the forcing structure moves to allow the spring to decompress and to force the cylinder away from the barrel.

Abstract: A noise suppression device for a firearm, the noise suppression device including a body including an outermost external surface of the noise suppression device, and an internal surface; a raised strip protruding from the outermost external surface of the noise suppression device; and a plurality of fins extending from the raised strip and spaced apart from each other at intervals along a length of the raised strip, wherein the noise suppression device includes no joints, no seams, or any formerly separate pieces within the body or the core.

Abstract: A noise suppression device for use with a firearm includes a body including an outermost external surface of the noise suppression device, an internal portion, a first end, and a second end; a core seamlessly connected to the internal portion of the body; and a spine protruding from the body, wherein the noise suppression device includes no joints, no seams, or any formerly separate pieces within the body or the core.

Abstract: A collapsible reflective optical sight for a firearm, including a base configured to mount the collapsible reflective optical sight to a firearm; a lens attached to and able to rotate with respect to the base, wherein the lens includes an optic with a reflective surface, and the lens is able to be folded with respect to the base to store the lens in a collapsed configuration and is able to be angled with respect to the base to aim the firearm with the lens in a deployed configuration; a light source on the base that reflects a light off the reflective surface of the optic to aim the firearm; and a mechanical sight adjustably mounted to the base to aim the firearm. Additionally, the collapsible reflective optical sight can include a firearm and a hood.

Abstract: An end cap for a weapon can include a sub-frame, a body, and a rail. The end cap is a modular buttstock interface cap (MBIC) with a NATO STANAG 4694 or MIL-STD-1913 (Picatinny) rail interface that provides interchangeability between braces, stocks, and other accessories for weapon systems, including weapons with recoil buffer systems within the weapon's receiver. The MBIC can be a three-dimensional-printed structure.

Abstract: A noise suppression device for use with a firearm includes a body including an outermost external surface of the noise suppression device, an internal portion, a first end, and a second end; and a core seamlessly connected to the internal portion of the body, wherein the noise suppression device includes no joints, no seams, or any formerly separate pieces within the body or the core, and a porosity of a first portion of the body that is adjacent to the first end is different than a porosity of a second portion of the body that is adjacent to the second end. Alternatively, the core includes a plurality of baffles, and a porosity of a first baffle that is adjacent to the first end is different than a porosity of a second baffle that is adjacent to the second end.

Abstract: A firing mechanism for a firearm includes a frame; a barrel attached to the frame and including a conical taper at a rear end of the barrel; a chamber attached to the frame and including a central bore through a center of the chamber and a conically tapered counter bore at a front end closest to the barrel; and a spring in the central bore to force the chamber backward.