Pistol - 7.62x51 - USA - Single Shot - The Lone Eagle by IMI is a curious blend of power and simplicity.  Instead of a bulky bolt-action, it employs a rugged and simple rotating gate version of the falling-block action.  The strength allows this single-shot pistol to fire full-power rifle cartridges.  The addition of the 4x handgun scope makes it deadly at very long ranges.  Recoil is rather unpleasent though.
