Abstract: A hand weapon includes a weapon housing, a breechblock accommodated in the housing for reciprocating motion, a bolt affixed to the breechblock and a slot, having opposite longitudinal edges, provided in the weapon housing. The bolt projects through the slot. There is further provided a slot guard arranged for covering the slot. The slot guard comprises a first and a second sealing lip held by the housing along respective longitudinal edges of the slot and projecting outwardly. The sealing lips are, at least along outer edge portions thereof, in a face-to-face engagement with one another and are locally spread apart by the bolt.

Abstract: A safety mechanism to prevent the accidental discharge of a firearm such as an automatic pistol when the firearm impacts on a hard surface utilizes a second spring loaded slide bolt as an impact safety in addition to a conventional, trigger-activated spring biased slide bolt. The second safety bolt and its bias spring are structured and located so that an impact which causes the trigger-activated safety bolt to move out of its normal "safety-on" position also causes the second slide to move against its bias spring to engage a recess on a firing pin and thereby prevent the weapon from firing. Also, when the firing pin is located in a slide of an automatic pistol, the slide, firing pin and hammer are structured so that a movement of the slide on impact towards the hammer causes the rear edge of the slide to strike the hammer with the firing pin spaced from the hammer.