Firearm with an expansion chamber with variable volume

A firearm comprising:

• a barrel having rifling;
• and
• a device for adjusting the volume available to the expansion of combustion gases as to regulate the pressure developed, in the volume available to the expansion of combustion gases, during firing of said firearm such that said firearm is suitable to the employment of ammunition having differing charges,
• said device comprising:
• (i) an expansion chamber connected to the barrel of said firearm through at least one connection hole of the barrel disposed near the beginning of the rifling;
• (ii) a front calibration screw, capable of being rotated into or out of said expansion chamber to calibrate said firearm for a particular ammunition;
• and
• (iii) a back calibration screw, capable of being rotated into or out of said expansion chamber to calibrate said firearm for a particular ammunition,
• wherein an angle between (i) an axis of said at least one connection hole, defined as the axis of said connection hole from said expansion chamber to said barrel and (ii) an axis of said barrel, is 90°.

A firearm comprising:

• a barrel having rifling;
• and
• a device for adjusting the volume available to the expansion of combustion gases as to regulate the pressure developed, in the volume available to the expansion of combustion gases, during firing of said firearm such that said firearm is suitable to the employment of ammunition having differing charges,
• said device comprising:
• (i) an expansion chamber connected to the barrel of said firearm through at least one connection hole of the barrel disposed near the beginning of the rifling;
• (ii) a front calibration screw, capable of being rotated into or out of said expansion chamber to calibrate said firearm for a particular ammunition;
• and
• (iii) a back calibration screw, capable of being rotated into or out of said expansion chamber to calibrate said firearm for a particular ammunition,
• wherein said front calibration screw and said back calibration screw each further comprising a heat resistant rubber sealing material.

A firearm comprising:

• a barrel having rifling;
• and
• a device for adjusting the volume available to the expansion of combustion gases as to regulate the pressure developed, in the volume available to the expansion of combustion gases, during firing of said firearm such that said firearm is suitable to the employment of ammunition having differing charges,
• said device comprising:
• (i) an expansion chamber connected to the barrel of said firearm through at least one connection hole of the barrel disposed near the beginning of the rifling;
• (ii) a front calibration screw, capable of being rotated into or out of said expansion chamber to calibrate said firearm for a particular ammunition;
• and
• (iii) a back calibration screw, capable of being rotated into or out of said expansion chamber to calibrate said firearm for a particular ammunition,
• wherein said front calibration screw and said back calibration screw each have a longitudinal axis parallel to a longitudinal axis of the barrel and are capable of being moved to adjust the length of the volume of the expansion chamber.

A firearm comprising:

• a barrel having rifling;
• and
• a device for adjusting the volume available to the expansion of combustion gases as to regulate the pressure developed, in the volume available to the expansion of combustion gases, during firing of said firearm such that said firearm is suitable to the employment of ammunition having differing charges,
• said device comprising:
• (i) an expansion chamber connected to the barrel of said firearm through at least one connection hole of the barrel disposed near the beginning of the rifling;
• (ii) a front calibration screw, capable of being rotated into or out of said expansion chamber to calibrate said firearm for a particular ammunition;
• and
• (iii) a back calibration screw, capable of being rotated into or out of said expansion chamber to calibrate said firearm for a particular ammunition,
• wherein said front calibration screw and said back calibration screw each have a diameter equal to the inner diameter of the expansion chamber.

A firearm comprising:

• a barrel having rifling;
• and
• a device for adjusting the volume available to the expansion of combustion gases as to regulate the pressure developed, in the volume available to the expansion of combustion gases, during firing of said firearm such that said firearm is suitable to the employment of ammunition having differing charges,
• said device comprising:
• (i) an expansion chamber connected to the barrel of said firearm through at least one connection hole of the barrel disposed near the beginning of the rifling;
• (ii) a front calibration screw, capable of being rotated into or out of said expansion chamber to calibrate said firearm for a particular ammunition;
• and
• (iii) a back calibration screw, capable of being rotated into or out of said expansion chamber to calibrate said firearm for a particular ammunition,
• wherein said expansion chamber is structured for being connected parallel to the barrel and for being located in a lower-back portion of the barrel or in an upper portion of the barrel,
• said expansion chamber comprising an inside threading capable of engagement with said back calibration screw and said front calibration screw, said front calibration screw capable of being operated manually by a threaded knob.