Abstract: A projectile for being propelled along a trajectory by propellant gases inside a launcher tube, the projectile including a casing, first pressure means for first pressurizing the casing without exploding the casing during firing of the projectile, and second pressure means for second pressurizing and exploding the casing, wherein the first pressure means includes part of propellant gases inside a launcher tube used to propel the projectile, or alternatively, gases generated by the first pressure means.

Abstract: The invention relates to a projectile 1 to trigger avalanches and intended to be projected by a launcher tube. This projectile comprises a casing 2 intended to explode in the vicinity of or in contact with the snow through the action of priming means in order to cause an avalanche.

Abstract: A muzzle brake for a large caliber gun barrel incorporating at least two vents making the inside of the brake communicate with at least two vanes, receiving the gases, that are integral with the outside of the brake. The brake has at least one internal cylindrical support of the same caliber as the barrel and placed downstream of the vents according to the direction of movement of a projectile fired from the barrel. The internal cylindrical support is separated from the vent or vents that precede it by a concave surface of revolution whose concavity is oriented towards the rear of the brake.

Abstract: The subject of the invention is a fastening device for a muzzle mirror at one end of an artillery gun barrel, device comprising a mirror support incorporating at least two flanges encircling the gun barrel and connected to one another by a first linking means. In this device the flanges are housed in a groove made in the barrel and are linked in rotation to said barrel by means of an obstacle, such as a pin, such device also comprising a centering collar constituted by at least two jaws connected by a second linking means, such collar having a tapered support co-operating with a matching tapered support arranged on the flanges such that tightening the second linking means ensures both the axial and radial retention of the flanges.

Abstract: A muzzle brake for a large or medium caliber barrel. The muzzle brake has a body whose inner dimensions are substantially greater than those of the barrel and which is fitted with at least one stage of two openings prolonged by vanes upon which the propellant gases are applied to create a force in the opposite direction to that generated by these gases. The muzzle brake comprises a tubular component prolonging the free end of the barrel, that is engaged in the body and pierced with several vents directing the propellant gases towards the vanes. The diameter of the tubular component is roughly between the caliber of the barrel and the diameter at the bottom of the rifling grooves of the barrel.