Insert for reducing the caliber of a weapon

摘要

An insert for a weapon barrel for facilitating the firing of a small caliber ammunition comprises a tubular member having a bore defining a distinct caliber with one end having an exterior surface ending in a raised shoulder forming an abutment for a compensating bushing positioned on the exterior surface and abutting the shoulder. A sleeve is positioned on the exterior surface alongside and abutting against the bushing. This end of the insert carries a first locking mechanism for locking the sleeve radially in the barrel. This includes a tapered spreader sleeve which engages with a tapered exterior surface of the sleeve positioned on the insert adjacent the compensating bushing. The spreader sleeve is urged into bearing engagement with the tapered surface of the other sleeve by means of a knot threaded over the insert and advanced toward the spreader sleeve. A safety key is insertable through an opening in the sleeve and it engages in a longitudinal slot formed on the insert. The opposite end of the insert includes a collet which bears against a raised annular portion of the insert which forms a stop. The collet carries a plurality of damping elements over which a thrust collar having a taper is positioned and the clamping elements are urged by one or more clamping screws to engage this end tightly against the conical portion of the cartridge chamber of the weapon barrel. A spreader sleeve at this end is advantageously threaded over a collar formation of the collet at its outer end, and the collet itself is advantageously threadably engaged on the insert.