Ruger 1704 GP161: Strength, Simplicity and Ruggedness. Ruger GP100 double-action revolvers are among the most comfortable shooting revolvers. Their rugged, medium-sized frame and cushioned grip system permit repeated firings with minimal shooter fatigue. Easy on the hand and budget, all GP100 revolvers boast solid steel sidewalls (no side-plates), and frame widths that are increased with extra steel in critical areas that support the barrel, making them rugged, reliable, and dependable.