.22 Small Bore K31 Training Rifle
Walter Lienhard was the Swiss equivalent of AG Parker & Parker Hale, well known for their Service Rifle & Pistol sub calibre inserts, conversions & accessories.
The highest known example is 344.
Lienhard K31 KK-Karabiner
Single shot, with a specially manufactured bolt that surrounds the barrel feeding the .22 cartridge straight in to the chamber.
Fitted with front / rear target sights & top rail for the alternative dipoter sight
Extremely Rare in the UK