Abstract: A round counter assembly for a firearm is provided. The round counter assembly has a pin for connecting a barrel assembly to a receiver portion of the firearm, a housing connected to the pin, a sensor in the housing for detecting the firing of ammunition from the firearm by a user, and a data processor in the housing connected to the sensor for receiving and storing data related to the firearm. The data can include some or all of the following: a count of the number of rounds of the ammunition fired from the firearm, frequency of firing the firearm, time of firing, angle of firing trajectory, identity of the firearm, or identity of the user. The data can be collected wirelessly, for example via a handheld device brought into proximity with the assembly.

Abstract: An accessory mounting rail for a firearm, which enables mounting of firearm accessories to the barrel of the firearm and reduces the potential for parallax error in mounted sights is disclosed herein. The accessory mounting rail is formed from a complementary pair of mounting bracket sides that are hinged together and have an aperture for receiving the barrel of the firearm. The accessory mounting rail is secured to the firearm through the use of a fastener to connect the complementary mounting bracket sides, which have provided upon them accessory rails.

Abstract: An accessory mounting rail for a firearm, which enables mounting of firearm accessories to the barrel of the firearm and reduces the potential for parallax error in mounted sights is disclosed herein. The accessory mounting rail is formed from a complementary pair of mounting bracket sides that are hinged together and have an aperture for receiving the barrel of the firearm. The accessory mounting rail is secured to the firearm through the use of a fastener to connect the complementary mounting bracket sides, which have provided upon them accessory rails.

Abstract: The invention is a blank firing attachment for use on a gas operated automatic rifle or light machine gun. The device restricts the exit of gases from the rifle barrel when a blank cartridge is fired, thus retaining sufficient gas pressure in the barrel to actuate the rifle's automatic firing mechanism and permit blank cartridges to be fired automatically or semiautomatically. The device has a body adapted to be attached to the muzzle compensator of a rifle and a stem having an axial cavity. The stem is adapted to seal against the inner bore of the compensator.