Abstract: The invention relates to a quick-assembly breech plug for muzzleloader firearms, allowing a quick assembly and disassembly and being extremely practical, simple to manufacture and having a low cost, wherein said breech plug comprises a cylindrical body (1), configured to be internally coupled in a rear end (10?) of a barrel (10), and a head (6) configured to define a limit coupling position of the breech plug inside the barrel (10), wherein the cylindrical body (1) externally comprises a male thread (2) having at least two starts located close to a front end (3) of the breech plug, opposite the head (6), according to a plane perpendicular to an axis of revolution of the cylindrical body (1), said male thread (2) being configured to screw into a female thread (10?) located internally in the rear end (10?) of the barrel (10), preferably 4 screw ridges.

Abstract: The invention relates to a single-shot rifle, comprising a receiver (1), a barrel (6) which is attached to the receiver (1), a bolt (8) housing a firing pin (24), located in correspondence with the back end of the barrel (6), wherein the bolt (8) and the back end of the barrel (6) are configured such that the bolt (8) can be coupled to the back end of the barrel (6) by means of a sliding movement in a direction perpendicular to the longitudinal direction, such that the bolt (8) can travel between a loading position in which it leaves the back end of the barrel (6) clear such that the user can introduce a bullet in a chamber of the barrel (6) through said back end of the barrel (6), and a firing position in which said chamber is locked by said bolt (8), the barrel (6) and the bolt (8) being attached by means of at least one rib (61) entering at least one channel (81).

Abstract: The invention relates to a single-shot rifle, comprising a receiver (1), a barrel (6) which is attached to the receiver (1), a bolt (8) housing a firing pin (24), located in correspondence with the back end of the barrel (6), wherein the bolt (8) and the back end of the barrel (6) are configured such that the bolt (8) can be coupled to the back end of the barrel (6) by means of a sliding movement in a direction perpendicular to the longitudinal direction, such that the bolt (8) can travel between a loading position in which it leaves the back end of the barrel (6) clear such that the user can introduce a bullet in a chamber of the barrel (6) through said back end of the barrel (6), and a firing position in which said chamber is locked by said bolt (8), the barrel (6) and the bolt (8) being attached by means of at least one rib (61) entering at least one channel (81).

Abstract: A muzzle-loading firearm has a barrel, a frame part, a breech plug, and a firing block arranged adjacent to the rear end of the breech plug, the firing block being slidably connected to the frame part so that said firing block can slide rectilinearly, in a direction substantially perpendicular to a longitudinal axis of the barrel, between a closed position in which the firing block covers the rear end of the breech plug, and an open position in which the firing block does not cover the rear end of the breech plug.

Abstract: A muzzle-loading firearm has a barrel, a frame part, a breech plug, and a firing pin housing arranged adjacent to the rear end of the breech plug. The firing pin housing is pivotally connected to the frame part such as to be pivotable in a plane perpendicular to the barrel, between a closed position in which the firing pin housing covers the rear end of the breech plug, and an open position in which the firing pin housing does not cover the rear end of the breech plug.