Abstract: External chassis device with internal mobile anchorage systems, positioning and automatic pre-fire retention system for tong arms comprised of external chassis, mobile anchorage by means of internal sliding rings, automatic positioning system by means of a pin and an arm retention system by means of a set of guides and elastic rings integrated in the sliding rings (B) which attach to the body of an arm (D), leaving the barrel free, with free telescopic movement inside an external chassis (A). It also has a positioning pin (G) to block the movement of the arm load and some guide slots (F) for retaining the arm in a fixed position before firing. Elastic rings (H) and screws (I) prevent the rotation of the sliding rings (B) and therefore of the arm (D) inside the chassis (A).

Abstract: The invention relates to an external chassis for a long firearm, the precision of which is increased owing to: 1. The incorporation of an external chassis, inside which the firearm is installed. 2. The anchoring of the firearm telescopically inside the external chassis using sliding rings with minimum friction. 3. The inclusion of a movement absorbing element. 4. The inclusion of guide bushings that limit the movement of the firearm to a single axis. With the above elements arranged as shown in the drawings, the inherent recoil produced in a firearm at the moment of firing, owing to the action-reaction effect of the stock-projectile assembly or the stock-discharge system, is suppressed and absorbed by the proposed invention, such that the stock remains immobile and no movement is transmitted to the shooter.

Abstract: The invention relates to an external chassis for a long firearm, the precision of which is increased owing to: 1. The incorporation of an external chassis, inside which the firearm is installed. 2. The anchoring of the firearm telescopically inside the external chassis using sliding rings with minimum friction. 3. The inclusion of a movement absorbing element. 4. The inclusion of guide bushings that limit the movement of the firearm to a single axis. With the above elements arranged as shown in the drawings, the inherent recoil produced in a firearm at the moment of firing, owing to the action-reaction effect of the stock-projectile assembly or the stock-discharge system, is suppressed and absorbed by the proposed invention, such that the stock remains immobile and no movement is transmitted to the shooter.