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Accessory Details: Diopter Karabiner 31   (Created: 20.05.2016, Changed: 28.12.2020)

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Accessory: Diopter Karabiner 31

Description:

Two contemporary and two new dioptre sight models exist for the Modell 1931 Carbine.   Models made by the Bern Weapons Factory (W+F): The contemporary models were manufactured by Waffenfabrik Bern (W+F). They differ in the W+F sight type "S" and the W+F sight type "K". Of the front sight tunnel also exist the types "S" and "K". For the W+F sight type "S" a milling had to be made on the left rear side of the breech housing, so that a surface for mounting was created. A screw thread was also added (see Picture). The W+F sight type "K" could be attached to the Modell 1931 Carbine without any modifications.   The front sight type "S" was soldered on the barrel of the Modell 1931 Carbine instead of the original front sight holder. It has a larger opening for front sights; the insert has an M18 x 0.75 thread. The front sight type "K", on the other hand, could be mounted on the existing front sight of the Modell 1931 Carbine without modification.   The W+F rear dioptre sight has a 5.5 x 0.5 thread for mounting iris apertures, which limits the choice.   Approval as an official aid was granted on January 11, 1963.   The W+F diopters are no longer manufactured. In recent years, Chinese copies have appeared on the market, but they do not match the originals in quality.   Threads used on the W+F sight and the W+F front sight tunnels. Unfortunately, the W+F sight and front sight tunnel do not really have common thread sizes. So special iris apertures for the sight and front sight tunnel have to be searched for and purchased. The threads are as follows: Iris aperture on W+F "K" and "S" sight: M5.5 x 0.5 Iris aperture on W+F "K" front sight tunnel: M12.7 x 0.5 Iris aperture on W+F "S" front sight tunnel: M18 x 0.75   Iris aperture Gehmann D75: On many W+F diopters there is an iris aperture made by Gehmann (mostly type D75). These iris apertures are older than 30 years. Sometimes these precision instruments are blocked due to gummed grease or oil and can no longer be moved. A request to the Gehmann company, which was answered within a very short time (many thanks!), resulted in the solution that the orifices should be soaked in an ultrasonic bath of rinsing agent for several hours. Trials with four such diaphragms have already achieved success after 45 minutes and the diaphragms are working properly again. However, the Gehmann company has clearly stated that this should only be used on normal iris aperture WITHOUT color filters.   Wyss sight type "W": The company Wyss Waffen in Burgdorf (http://www.wysswaffen.ch) manufactures the Wyss sight type "W". This is designed according to the latest knowledge and allows the mounting of a standard iris apertures by means of M 9.5 x 1 thread. The Wyss diopter also includes the front sight tunnel type "W", which can be screwed onto the existing front sight base. However, to do this, the front sight must first be removed using a front sight pusher.   Swiss Products Type P/S sight: http://www.swissproductsllc.com

 
 

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Modell 1931 Carbine
 
 

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