The Original - Standard Bipod with ski feet (ridge metal feet). Adjusts from 9" to 12" fully extended. (1.04 lbs [0.47 kg]) Model 1 Bipod The Model 1 - the all-around size for the versatile shooter. The Model 1 is a very popular choice. With its ski feet, the Model 1 can be used on many natural terrains especially slick surfaces to lock into place for accuracy and comfort. Perfect for porous surfaces i.e. mud, clay, soggy grass, etc. The legs have ski feet that extend from 9 inches to 12 inches. It is a very popular choice. With its ski feet, the Model 1 can be used on many natural terrains especially slick surfaces to lock into place for accuracy and comfort. It is perfect for porous surfaces i.e. mud, clay, soggy grass, etc. This bipod comes with spring-loaded legs. The legs have ski feet that extend from 9 inches to 12 inches.