Housing for a rifle

Casing (2) for a rifle, with a first anchor (12) for a barrel (3), a second anchor (15) for a cylinder head (5), a guide (11) for a bolt (6) which can locked with the barrel (3); and a housing (20) for a trigger (8) which interacts with the bolt (6), characterized in that the monoblock (2) is subdivided into a lower part (9) and an upper part (10) separated from the first, which however can join for fixed thereto, forming the lower part (9) anchors (12, 15) for the barrel (3) and the cylinder head (5) and the housing (20) for the trigger (8) and the upper part (10) the guide (11) for the bolt (6).