The rear sight was of tangent type, adjustable from 100 to 1000 meters range. SIG submachine guns, purchased by Japan, were also fitted with bayonet mount. Barrel was enclosed into the tubular jacket, perforated for better cooling. This cut was used to lock the bolt in its rearward position by putting the cocking handle into the cut. The manual safety consisted of the L-shaped cut, made at the rear of the cocking handle slot. The Spectre M4 is an Italian submachine gun that was produced by the SITES factory in Turin. Magazine is inserted from the left (right on Model 1930) side. Tubular receiver is attached to the front of the wooden stock, and could be pivoted barrel down for maintenance and disassembly. The SIG Model 1920 "Brevet Bergmann" submachine gun is a blowback operated, full automatic only weapon that fires from open bolt. This was made to avoid users gripping the long magazine with left hand, which could result in feeding problems. In 1930 SIG introduced an improved version of this design, which differed in the placement of the magazine (on the right side), and also had a detachable forward vertical grip below the stock. Versions in the 7.63 Mauser caliber were sold to Japan and China. The version of the SIG M1920 in 7.65 Luger caliber was sold to Finland. The designer set out to develop a weapon that could be used intuitively and automatically so that the user could instantly open fire without considering the safety condition or performing any action other than pulling the trigger. UZI had been adopted by police and military of more than 90 countries, including Israel (now only in reserve), Germany, Belgium. Spectre M4 submachine gun appeared in 1983 and has several unusual features. Each SIG model 1920 submachine gun was marked "Brevet Bergmann" (Bergmann patent) on the top of the magazine housing. The UZI submachine gun was developed in Israel by designer Uziel Gal in around 1949, and manufactured by IMI (now IWI Ltd) since about 1951. SIG Model 1920 differed from its German-made prototype by having magazine of greater capacity, and different calibers (7.65 Parabellum and 7.63 Mauser). It was produced in Switzerland by famous arms-making factory SIG in Neuhausen, between 19. The SIG Model 1920 submachine gun was a licensed copy of the modified Bergmann / Schmeisser MP.18/I submachine gun. SIG Model 1920 "Brevet Bergmann" submachine gun.ħ.65×22 Luger / Parabellum, 7.63×25 Mauser
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