| 摘要 |
Improvement to firearms suitable for utilisation with different types of ammunitions, in conditions of absolute safety, said firearm comprising an expansion chamber (10) that communicates with barrel (1) of the firearm through at least one connecting hole (14), a front and a back calibration screw (13, 12), for increasing the volume available to the expansion of combustion gases. Said hollow expansion chamber (10) is located in the lower back part (9) of the barrel (1), (or possibly in its upper part, in parallel to it); said expansion chamber (10) being equipped with an internal threading (11) which is capable of engaging itself to back calibration screw (12) in the distal back part, and a further calibration screw (13), which can be manually operated by a threaded knob (13a), located in the front part.
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