Could be anything, although they had 22 caliber conversion kits for the same reason we (US Army) have/had 22's, to encourage and get troops used to shooting. Looks like a saturday morning shooting match to me 
Ed
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Edward Tinker
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Co-Author of Police Lugers - Co-Author of Simson Lugers
Author of Veteran Bring Backs Vol I, Vol II, Vol III and Vol IV
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