Pneumatic gun for fixing elements

A pneumatic gun for fixing elements, comprising a body (2) provided with pneumatically-actuated means for expelling said elements, a handle (3) that protrudes from said body(2) and a magazine (4) for storing and individually feeding the fixing elements, which is constituted by a box-like container (11) having a sliding flap (13) for inserting said elements, said body (2) having a working head (8) for driving said elements that can be coupled to a complementary end head (9) of said box-like container (11) having an opening (18) for the passage of said elements and forming, together with said head (8), a firing channel (7) for said elements, a guide (38) running from said head (8) to said handle (3) and coupled slidingly with said box-like container (11) so as to allow a manual translational motion of said magazine (4) from a first active end position, in which said complementary head (9) is adjacent to said head (8), allowing the expulsion of said elements through said firing channel (7), to a second position, in which said complementary head (9) is substantially spaced from said head (8) in order to allow access to said firing channel (7), said guide (38) being provided with means (48) for rapid manual locking and release of the translational motion of said box-like container (11), said locking and release means (48) having a releasable safety closure (49) for preventing the translational motion of said box-like container (11) when in the second position and accidental disengagement from said guide (38), the safety closure having means for stopping a stroke of the magazine said means being an insert (57) engaged detachably in a respective pocket (58) provided in said guide (38), for abutting against a retention protrusion (59) provided along said box-like container (11) such that to produce a further translational motion of the magazine (4) with respect to the guide or to extract the magazine completely, the insert (57) must be removed from the respective pocket.