A handheld measurement, search and safety device that includes a main frame having a handle, an extendable member that slides outwards from the main frame in measured increments, and an interchangeable support brace comprising either a buttstock or arm brace to allow responders to use the extendable member to survey hazardous materials at a distance, or a one-handed configuration used to survey hazard materials in confined areas. The handheld measurement, search and safety device includes a plurality of picatinny rails disposed on both the main frame and extendable member to removably mount a host of different field survey instruments and/or tactical accessories for detecting, locating, identifying, measuring, or sampling hazardous materials including radioactive materials or toxic chemicals.

The present disclosure provides systems and techniques for an attachment that can be fastened to a gun. The attachment may include a top surface having a longitudinal axis and an aiming sight that is parallel with the longitudinal axis, a front surface having a latitudinal axis that is perpendicular to the longitudinal axis, the front surface including a muzzle aperture, a left surface, a right surface, and a fastening system. The fastening system may include a first mounting aperture of the left surface, a second mounting aperture of the right surface, and a locking pin capable of being positioned in the first mounting aperture and in the second mounting aperture such that the locking pin fastens the attachment to the gun. The attachment may be fastened to the gun such that the longitudinal axis is parallel with a longitudinal bore axis of the gun.

An electrical power source for a firearm includes a housing, one or more rechargeable power cells stored inside the housing, and a microcontroller unit that receives data on a condition of the one or more rechargeable power cells. A network interface controller embeds the data onto an electrical circuit that is configured to be received by a firearm accessory mounted to the firearm. The data embedded on the electrical circuit is usable by the firearm accessory to provide a status of the electrical power source.

An electrical power source for a firearm includes a housing, one or more rechargeable power cells stored inside the housing, and a microcontroller unit that receives data on a condition of the one or more rechargeable power cells. A network interface controller embeds the data onto an electrical circuit that is configured to be received by a firearm accessory mounted to the firearm. The data embedded on the electrical circuit is usable by the firearm accessory to provide a status of the electrical power source.

The present disclosure provides systems and techniques for determining whether a user is holding a gun. The gun may include a sensor, such as a laser proximity sensor, a capacitive proximity sensor, a load cell, an accelerometer, or a biometric sensor, and the gun may determine whether a user is holding the gun based on an output generated by the sensor. A processor housed in the gun may identify activation of a proximity sensor, determine that a user is holding the gun based on the activation of the proximity sensor, and perform an action in response to determining that the user is holding the gun. The action performed by the processor may include performing a boot procedure, performing a health check procedure, visually indicating state information about the gun, audibly indicating state information about the gun, or tactilely indicating state information about the gun.

A firearm accessory and associated components and methods. In one embodiment, a firearm accessory is configured to mount to a shotgun. The firearm accessory is configured to emit light to illuminate a target. The firearm accessory includes an accessory body that is removable from the shotgun and permits convenient battery replacement.

A firearm accessory and associated components and methods. In one embodiment, a firearm accessory is configured to mount to a shotgun. The firearm accessory is configured to emit light to illuminate a target. The firearm accessory includes an accessory body that is removable from the shotgun and permits convenient battery replacement.

A firearm includes a lower receiver storing an electrical power source and an upper receiver attached to the lower receiver. A pivot pin device provides a mechanical pivot point between the upper and lower receivers and a transfer of electrical power from the electrical power source in the lower receiver to at least one accessory rail attached to the upper receiver. The at least one accessory rail has electrical contacts that engage corresponding contacts on an electronic accessory device to supply the electrical power to the electronic accessory device.

A firearm includes a lower receiver storing an electrical power source and an upper receiver attached to the lower receiver. A pivot pin device provides a mechanical pivot point between the upper and lower receivers and a transfer of electrical power from the electrical power source in the lower receiver to at least one accessory rail attached to the upper receiver. The at least one accessory rail has electrical contacts that engage corresponding contacts on an electronic accessory device to supply the electrical power to the electronic accessory device.

A pistol brace includes a main frame, a forward hand grip, an adjustable front bracket attaching the main frame to the forward hand grip, a pistol muzzle guard extending forwardly at a top of the hand grip, a stock frame member attached to a rear of the main frame by an adjustable stock bracket having a stock pivot hinge for collapsing and extending the stock frame member. A stock adjustment slide allows for adjustment of the length of the stock to accommodate different size operators. A collapsible butt stock is pivotally fitted to an end of the stock frame member. A rail mount above the forward hand grip attaches to a picatinny rail on an underside of the pistol barrel and a pistol grip mounting mechanism and a pistol locking mechanism secure the grip of the pistol to the main frame.