Quick-disassemble snapping device of a rivet gun

A quick-disassemble snapping device of a rivet gun comprising:

• a front sleeve having
• a rear end edge;
• multiple positioning recesses separately formed in the rear end edge of the front sleeve, and each of the positioning recesses axially extending;
• and
• an inner thread formed on an inner sidewall of the front sleeve and disposed at a rear end of the front sleeve;
• a rear sleeve coaxially connected with the front sleeve and having
• a front end protruding into the rear end of the front sleeve;
• an outer flange formed on and around an outer sidewall of the rear sleeve, radially extending, and having an outer peripheral edge;
• at least one mounting recess formed in the outer peripheral edge of the outer flange, and each of the at least one mounting recess radially extending and corresponding in position to one of the positioning recesses of the front sleeve;
• and
• an outer thread formed on the outer sidewall of the rear sleeve, disposed between the outer flange and the front end of the rear sleeve, and engaging with the inner thread of the front sleeve;
• a snapping assembly mounted in the front sleeve and the rear sleeve;
• and
• a retaining assembly mounted around the outer sidewall of the rear sleeve, disposed between the outer flange and a rear end of the rear sleeve, and including
• a locking ring mounted around the rear sleeve and having
• a front end edge facing toward the outer flange of the rear sleeve;
• and
• at least one engaging tooth axially protruding from the front end edge of the locking ring, and each of the at least one engaging tooth mounted through a corresponding one of the at least one mounting recess of the rear sleeve and engaging in the positioning recess that corresponds in position to the corresponding one of the at least one mounting recess;
• a stop ring stationarily mounted around the rear sleeve;
• and
• an outer spring being a compression spring, mounted around the rear sleeve, and disposed between the locking ring and the stop ring, and the outer spring having two opposite ends respectively abutting against the locking ring and the stop ring.