The Welrod silenced pistol was developed by Station IX at the request of SOE. By '42 a facility at Welwyn had developed a rather lightweight (2.5 lbs) pistol in either 9mm or 32 ACP that could be broken down into 2 parts (mag/grip + rest of the gun). It was easy to conceal for resistance fighters all over Europe and was dead silent with integral silencer. The mag could hold 6 rds but the operation was weird. The butt knob was twisted and then the bolt was manually moved forward which chambered a single round and cocked the striker. Then the knob was twisted again to lock and the firer moved his hand to the grip which released the rear safety once gripped firmly. Then a trigger pull. The pistol was ported ahead of the silencer to reduce the 9mm velocity to subsonic and further quiet the pistol ahead of the baffles of the cylindrical silencer which covered the barrel. There was a horizontal lever below the trigger to release the mag as well. This weapon as Mk. 1 and modified Mk.II was issued to resistance fighters and British SOE as well as American OSS... but was primarily used in Denmark for some reason. After the war, the Welrod ceased being produced by BSA and a Mk.III was invented for fighting in the Falklands and N Ireland. Supposedly, a Mk.IV was made for "Desert Storm" usage. No manufacturing logos were ever put on the weapons, just a serial number on the bottom of the silencer near the front.

Additional info: In the 1990s in the US a group of female bikers calling themselves the "Iron Coven" made a variation of the Welrod based on schematics and called it "The Coil Snake." A few were captured in a police raid on the group.