Methods and apparatuses are described herein for producing a rifling in a barrel of a gun. The barrel defines an axis in a longitudinal direction and comprises an inner wall that defines a bore extending in the longitudinal direction. A tool includes a tool head having an outer contour that corresponds to a shape of the rifling to be produced. The tool head consists of an electrically conductive material. The outer contour of the tool head and the inner wall of the barrel define a gap. An electrolyte solution is pumped through the gap while the tool is guided through the bore, and a pulsed electrical voltage is applied to the barrel and the tool. The barrel is the anode and the tool head is the cathode. The tool is moved through the bore and rotated about the longitudinal axis while the pulsed voltage is applied to produce the riflings.

A machine gun has a barrel, a receiver assembly comprising a cover, a receiver base and a butt; lock frame comprising an extractor and a gas piston; bolt, return mainspring with guiding bar, gas piston tube, flash absorber, trigger mechanism, gunsight, butt sighting appliances, trigger pull and loading case. A barrel is made of a preform produced of steel. The barrel is coated inside and steel comprises the additional chemical elements.

A machine gun has a barrel, a receiver assembly comprising a cover, a receiver base and a butt; lock frame comprising an extractor and a gas piston; bolt, return mainspring with guiding bar, gas piston tube, flash absorber, trigger mechanism, gunsight, butt sighting appliances, trigger pull and loading case. A barrel is made of a preform produced of steel. The barrel is coated inside and steel comprises the additional chemical elements.

A barrel for use in a firearm optimized to fire subsonic ammunition with high precision. The barrel groove diameter being within 0.0003 inch of the nominal bullet diameter and the barrel has at least 8 rifled grooves. Each of the plurality of rifling grooves has a sidewall formed from the bore diameter to the groove diameter, wherein the sidewalls formed are substantially parallel and the depth of each of the rifling grooves is shallow. The bullet is obturated as the bullet is forced down the bore. The plurality of shallow barrel grooves forming a plurality of raised lands upon the bullet. The obturated bullet having at least 50% lands formed around the circumference of the bullet body. The buffeting effect upon the bullet in flight by a transition shock wave upon the raised bullet lands is reduced by the plurality of bullet lands and the reduced height of each of the plurality of bullet lands.

A barrel for use in a firearm optimized to fire subsonic ammunition with high precision. The barrel groove diameter being within 0.0003 inch of the nominal bullet diameter and the barrel has at least 8 rifled grooves. Each of the plurality of rifling grooves has a sidewall formed from the bore diameter to the groove diameter, wherein the sidewalls formed are substantially parallel and the depth of each of the rifling grooves is shallow. The bullet is obturated as the bullet is forced down the bore. The plurality of shallow barrel grooves forming a plurality of raised lands upon the bullet. The obturated bullet having at least 50% lands formed around the circumference of the bullet body. The buffeting effect upon the bullet in flight by a transition shock wave upon the raised bullet lands is reduced by the plurality of bullet lands and the reduced height of each of the plurality of bullet lands.

In order to provide an economical method for producing a weapon barrel, in which a considerable plasticisation of the barrel inner wall and thus of the twist profile is avoided when armour-piercing ammunition is shot, in particular in the case of an intense firing sequence, it is proposed not to introduce the twist profile of the weapon barrel into a barrel blank, the material of which has its end strength already as a result of hardening and tempering, but has a lower strength level (approximately 800-1000 MPa). Only once the twist profile has been formed by extrusion or hammering is the steel hardened and tempered to a predefined strength value >1000 MPa, and is the barrel blank that is provided with the twist profile mechanically processed further.

Various embodiments are directed to a barrel for a firearm. In various embodiments, a barrel comprises an inner surface defining a bore configured to guide a projectile as the projectile is propelled through the bore by pressurized gas; and a barrel gas port having a gas port depth extending between a port entrance defined by the inner surface of the barrel and a port exit, wherein the barrel gas port is configured to fluidically communicate with the bore and an action of the firearm; wherein the port entrance defines a length dimension defined parallel to a longitudinal axis of the barrel and a width dimension defined perpendicular to the length dimension; and wherein the length dimension of the port entrance is greater than the width dimension of the port entrance. Various embodiments are directed to a firearm comprising the exemplary barrel.

Various embodiments are directed to a barrel for a firearm. In various embodiments, a barrel comprises an inner surface defining a bore configured to guide a projectile as the projectile is propelled through the bore by pressurized gas; and a barrel gas port having a gas port depth extending between a port entrance defined by the inner surface of the barrel and a port exit, wherein the barrel gas port is configured to fluidically communicate with the bore and an action of the firearm; wherein the port entrance defines a length dimension defined parallel to a longitudinal axis of the barrel and a width dimension defined perpendicular to the length dimension; and wherein the length dimension of the port entrance is greater than the width dimension of the port entrance. Various embodiments are directed to a firearm comprising the exemplary barrel.

A single-point rifling tool including a rifling head with a lateral opening, a hook ramp stationarily secured at a first end of the lateral opening, and a cutting tool movably secured at a second end of the lateral opening. The cutting tool is movable along an angled surface of the hook ramp between a retracted position and a cutting position so as to perform a rifling operation in only a single direction through a gun barrel so as to perform a rifling operation in only a single direction through a gun barrel.

A single-point rifling tool including a rifling head with a lateral opening, a hook ramp stationarily secured at a first end of the lateral opening, and a cutting tool movably secured at a second end of the lateral opening. The cutting tool is movable along an angled surface of the hook ramp between a retracted position and a cutting position so as to perform a rifling operation in only a single direction through a gun barrel so as to perform a rifling operation in only a single direction through a gun barrel.