diana mauser k98 underlever .22 caliber pellet air rifle diana diana has combined their proven underlever design with a mauser k98 inspired stock for a nostalgic winner! anyone would be proud to add this replica to their collection! based on the famous german bolt-action rifle, the diana mauser k98 is a military collector's dream with its handsome, hardwood stock with metal fittings and high quality 2-stage adjustable t06 trigger. the gun features a fixed barrel with the under cocking lever system. this locking system and direct in-rifling pellet seating produces maximum speed.