Firearms, breechblock stops for firearms and methods of operating the same are disclosed. An example firearm includes a trigger that requires a force to be released, a trigger guard, a breechblock, and a spring-loaded breechblock stop that is operable between a resting position and an operative position. The example breechblock stop includes a slider control that has a control extension in the trigger guard. The firearm also includes a removable ammunition magazine that includes a follower. The breechblock stop may be moved between an operative position and a resting position by one of engagement with the follower of the magazine or actuation of the slider in a direction of operation essentially perpendicular to force releasing the trigger. Furthermore, the breechblock is unlocked in a released position when the breechblock stop is in the resting position, and the breechblock is locked in an open position when the breechblock stop is in the operative position.