Abstract: The invention relates to a training weapon system for a portable recoilless anti-armor weapon of the type which comprises a sub-caliber insert barrel (1) arranged in the bore of the launching barrel of the full-caliber weapon. In order to improve the accuracy of the system and make it more safe as well as less expensive when compared to previous systems of this type, the sub-caliber insert barrel (1) has a rifled bore to make the training projectile spin stabilized. The forward aligning member (5) for centering the insert barrel (1) is engaging the ridges of the rifles in the rifled portion of the barrel in the recoilless full caliber weapon. By such an arrangement it can be avoided that length tolerances give rise to undesired radical deviations which might result in a mis-alignment of the insert barrel (1) within the gun bore. This could happen with the forward aligning member engaging the conical, smooth-bored firing chamber in the barrel.

Abstract: The invention relates to a bottom plate member (6) which is designed and made for initially tightening a chamber in which a high gas pressure is generated, for example the propellant charge chamber (4) in an ammuniton round for a recoilless weapon system or in pipes or containers within the process industry. The plate member (6) is breakable and opens for the gases to exit when the gas pressure within the chamber exceeds a certain level. The plate member has a through hole (12) in the center which gives an effective starting point for the cracking process as well as fractural impressions (10) to control the cracking process so that the plate is divided into a number of well defined parts of flaps (11) which are connected to each other. The plate member (6) further comprises a number of straight edges (16), which number corresponds to the number of flaps (11), against which edges the base of the flaps are arranged to be folded when the plate member opens due to the gas pressure.

Abstract: A practice weapon for a hand-held recoilless anti-armor weapon including a sub-calibre barrel mounted in a full caliber barrel to enable a marksman to repeatedly train and be subjected to the powerful noise and pressure effects of firing a full caliber weapon. The practice weapon according to the invention includes a marker charge, which is arranged to be ignited in response to firing of a sub-caliber practice round. In order to transfer the ignition sequence in a simple fashion with few moving parts, the marker charge is arranged to be ignited by the jet of flame and powder gases generated by the firing of the practice round.