referred to as "The Gun", drew so much attention that it actually spurred considerable fan mail, and was often so addressed. Internally designated the "U.N.C.L.E. Special", it was a modular semi-automatic firearm weapon. The basic pistol could be converted into a longer-range carbine by attaching a long barrel, an extendable shoulder stock, a telescopic sight, and an extended magazine. In this "carbine mode", the pistol could fire on full automatic. This capability brought authorities to the set to investigate reports that the studio was illegally manufacturing machine guns. They threatened to confiscate the prop guns and it took a tour of the prop room to convince them that these were actually "dummy" pistols incapable of firing live ammunition. The actual pistol used as the prop was the Mauser Model 1934 Pocket Pistol, but it was unreliable, it jammed constantly, and it was dwarfed by the carbine accessories. It was soon replaced by the larger and more-reliable Walther P38. The long magazine was actually a standard magazine with a dummy extension, but it inspired several small-arms manufacturers to begin making long magazines for various pistols. While many of these continue to be available 40 years later, long magazines were not available for the P38 for some years. THRUSH had a range of weaponry of its own, much of them only in the development stage before being destroyed by the heroes. A notable item was the infrared sniperscope, enabling villains to aim gunfire in total darkness. The prop was built from a U.S. Army-surplus M1 carbine, with a vertical foregrip and barrel compensator, and using army-surplus infrared scopes. The infrared special effect was achieved using a searchlight to illuminate the target. The viewfinder image was a negative version of the film. When the scopes were switched on a pulsing chirp sound effect was used. The fully equipped carbines were seen only once, in "The Iowa Scuba Affair". After that, a mockup of the scope was used to make handling easier. German small arms were well represented in the series. Not only were P38s frequently seen (both as the U.N.C.L.E. Special and in standard configuration), but also the Luger pistol. In the pilot episode "The Vulcan Affair", Illya Kuryakin is carrying a M1911 pistol. The Mauser C96 and MP 40 machine pistols were favored by opponents. U.N.C.L.E. also used the MP 40. Beginning in the third season, both U.N.C.L.E and THRUSH agents used