The Classic American Pump Pistol. The .177 caliber pneumatic air pistol features a single-action bolt design for easier cocking and loading, a rifled steel barrel for accuracy and an easy-pump forearm for variable pump power. The P1377 features fully adjustable rear peep or open sights and a fixed blade front. The variable pump power let you control the velocity for whatever shooting you are doing. Lead Pellet Velocity: Up to 600 fps.