the grip varies widely in styles. a "straight grip" stock (a) proceeds smoothly from toe to the trigger, giving a nearly horizontal holding angle for the trigger hand, while a full "pistol grip" stock (e) contains a separate stand-out grip piece, providing a nearly vertical angle for the trigger hand for maximal ergonomics, and is commonly found on modern military rifles such as the ubiquitous ak-47 and m16/m4 families of assault rifles. in between the two extremes, the "semi-grip" stock (b) is perhaps the most common sporting rifle stock, with a steeper angle cut into the stock to provide a more diagonal angle for the trigger hand. modern target-style stocks have generally moved towards a fuller, more vertical grip, though built into the stock rather than made as a separate piece. "anschütz grip" stocks (c), for example, use a nearly vertical grip, and many "thumbhole grip" stocks (d) are similar to pistol grips in shape.