A firearm (10) comprising a receiver, a lower receiver (9), a magazine (16) supported by a magazine catch (12), a grip (11), a bolt (17') and a bolt-slide (17) moveable during the firing procedure of a shot and a slide catch lever (13) for the automatic blocking of said slide (17) when said magazine (16) is empty, characterized in that it comprises a moveable ergonomic control group (14) for the ejection of said magazine (16) and activation of said slide catch lever (13), said moveable ergonomic control group (14) being manually activated by the user with the same hand holding said grip (11).