This is a Nemrod "Fragata" from the early sixties and is a typical high compression ratio, low start pressure gun. On these guns the spear is caught by a trigger mechanism in the grip handle and nothing is inside the rear tank section but compressed air. In a sense the gun is not unlike a “Sten” with the outer tank removed and a small tank installed on the rear end of the inner barrel. Nemrod’s next largest gun was the “Crucero” with a surcompressor on the rear tank operated by an external pivoting lever, however the “Fragata” would have been a less troublesome gun to use as sand getting in the sliding tank mechanism was always a possibility if you dropped the “Crucero” on a sandy bottom.