An improved trigger mechanism for a single action revolver. The device features a pawl which rotationally mounts upon a hammer having a firing position in which a hammer is cocked, and having an at rest position in which the hammer is biased against the revolver frame. The pawl has an engagement end which cooperatively engages and rotates an indexing ratchet of a rotating cylinder at a first end. A means for disengagement of the engagement end of the pawl from cooperative engagement with the indexing ratchet when hammer is in said at rest position is provided by a second section extending from an axis pin providing a mount for the pawl on the trigger hammer. A cam end having a length determined to provide operative contact with an interior wall surface of a shaft formed in said revolver causes a rotation of the pawl upon the axis pin thereby laterally translating said engagement end out of operative engagement with the cylinder ratchet when the hammer is rotated to said resting position. The resulting disengagement of the engagement end and the cylinder indexing ratchet provides for a free spin of the cylinder of the revolver in either direction during loading and unloading of the revolver. Other embodiments provide for disengagement of the engagement end of the pawl from cooperative engagement with the indexing ratchet when hammer is in said at rest position which could be incorporated in newly designed revolvers.