Nail-driving gun barrel assembly with a safe and robust cartridge ejection mechanism

A nail-driving gun barrel assembly with a safe and robust cartridge ejection mechanism, comprising:

• an axially extending barrel extending along an axial direction and having a firing end portion that is adapted to accommodate an explosive cartridge, said firing end portion having a first cutout recess, a cylindrical segment, and a protruding segment that protrudes from said cylindrical segment along said axial direction and that cooperates with said cylindrical segment to define said first cutout recess, said protruding segment being formed with a first groove that extends in said axial direction;
• and
• an ejector in the form of a generally cylindrical block that has a second cutout recess, a sleeve part, and a projecting part which protrudes from said sleeve part in said axial direction and which cooperates with said sleeve part to define said second cutout recess, said sleeve part being coaxially and slidably sleeved on and in sliding contact with said cylindrical segment so as to permit said ejector to be slidable on said cylindrical segment between first and second axial positions for ejecting the explosive cartridge out of said firing end portion of said barrel, said projecting part being formed with a second groove that extends in said axial direction;
• wherein when said ejector is disposed at the first axial position, said protruding segment is disposed in said second cutout recess, said projecting part extends into said first cutout recess, and said first and second grooves mate each other to define a cylindrical bore that is adapted to accommodate the explosive cartridge;
• and
• wherein when said ejector is disposed at the second axial position, said projecting part protrudes outwardly of said first cutout recess and said first and second grooves do not mate each other to define said cylindrical bore.