Abstract: A conveying and separation assembly for the impact material of a ballistic projectile arrester for indoor firing grounds, of the type that comprises a heap of granulated material as the impact material, and a pneumatic conveyor for sending the granulated material once it has been separated from the exploded projectiles up to the top of said heap. The assembly comprises a variable-diameter worm screw or helical screw, that rotates about a horizontal axis and is arranged within a half cylinder which is open at its upper portion, the worm screw lying in a direction substantially parallel to that from which the projectiles come; a motor for the worm screw; and gravity separation of the exploded projectiles from the granulated material; the half cylinder being connected, at its rear terminal part, with the worm screw or pneumatic conveyor which are employed for sending the material to the top of the heap.

Abstract: A self-regeneration ballistic projectile-arrester, suitable for small arms indoor firing ranges comprises granulated material in form of a heap, to absorb the kinetic energy of the fired projectiles. A pair of belts moving in opposite and converging directions, and being inclinable with respect to the firing plane and being spaced from and opposite to one another, are arranged as supports at the bottom of the material heap with their longitudinal axis parallel to the firing axis, for conveying the material towards a zone where it is separated from the exploded projectiles. The regenerated material is then carried onto the top of the heap for recycling.