The invention concerns a pistol with a housing (1), breech part (4) movable relative to housing (1), a barrel (5) arranged within breech part (4) and a trigger system (14, 15 16). The housing (1) according to the invention contains a receiver (2) and an upper housing part (3) designed in one part with it, which encloses the breech part (4) with the barrel (5) arranged in it.