What really gave me trouble was the 20mm Solothurn Anti-tank rifles. I somehow got mixed up with a batch of these being test fired at the British base and I have not been the same since. The 20mm is too much cartridge to shoot from a shoulder gun. These big rifles are 120 pounds of semi-automatic bipod gun and very rough on the firer, in spite of the muzzle brake and spring and rubber shoulder piece. They had a good, but heavy, 2.75X telescopic sight.