The weapon is the Littlejohn adaptor.
The "sandpeople" are Jawa's and so is the Jawa 353 250cc bike!
The man on the picture is Mr. Frantisek Karel Janeček. In BSA connection "Littlejohn".
He is better known as the founder of the Jawa Motorcycle company and in this case
the inventor of the Littlejohn adaptor.
Waleed is indeed correct!
The answer is Frantisek Karel Janeček, inventor of the Littlejohn adaptor during WWII, and founder of Jawa...but that little sentence is perhaps selling the guy a little short!!!
Frantisek Karel Janecek was born into a wealthy Bohemian family in 1878 and married Baroness Carolina Strijk van Lindschoten with whom he had one son, Frantisek Karel Jnr in 1904. Their Prague based armaments factory expanded into motorcycle production in 1929, building under licence a copy of the Chemnitz built Wanderer motorcycle from adjacent Saxony. It was a combination of the first two letters of
Janecek and
Wanderer that gave us the Jawa motorcycle name.
After the Nazi invasion of Sudentenland in 1938, threatening the Janecek family estates, Frantisek Karel Jnr visited Britain regularly to try to interest the British government in his latest design for an anti tank gun. During one such trip, Frantisek Karel Jnr learned that Prague had fallen and just hours before the Nazis marched in, George Patchett (Janecek's English two-stroke designer/motorcycle racer) had thrown the only two prototypes of this new weapon over the wall of the British Embassy, from where they were subsequently smuggled to Britain safely inside a sofa.
George Patchett himself soon returned to Britain, walking past the distracted Nazi border guards with the blueprints in his jacket pocket, as they listened intently to a radio broadcast from the Führer.
Frantisek Karel Jnr stayed in Britain by pretending to the Nazis that he was there to spy on British armour plating technology, whilst simultaneously working for British Intelligence. At the outbreak of hostilities in 1939, British Military Intelligence informed the Nazi authorities that Frantisek Karel Jnr was a prisoner of war in Canada, whilst he actually worked throughout the war for BSA in Birmingham under the name of Littlejohn,
the literal English translation of Janecek 
The Littlejohn Adaptor that was developed from his designs was an attachment that screwed to the end of the existing British two-pound anti-tank gun, converting it to squeeze bore operation. As the hard cored tungsten round entered the adaptor its soft outer shell was compressed from 40mm to 30mm, giving it a smaller cross section, but with the same mass. Together with the increasing pressure within the tapered barrel, the round emerged as an APSV (armour piercing super velocity) projectile.
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