The Tarn was a 9x19mm pistol developed by a Polish ex=pat designer named Z. de Lubicz Bakanowski. It was a simple blowback design, with a quite heavy slide and recoil spring. It was manufactured by the Swift Rifle Company, and ten examples were made as prototypes. They were tested formally by the British in April 1945, and rejected on grounds of being overly violent in action, difficult to charge, and inaccurate. The FN High Power would be pursued instead, and the Tarn saw no further production or development.