Harris swivel 12 to 27 triple extention, l mainly have it fixed to my rifle unless l know l am going to have a session in the highseat, all of my local stalking is a mix of woodland and farmland so l also stalk with sticks, so all situations are covered, weight is no problem at the moment l don’t use a mod, but l am finding more these days that l am taking far more of the sticks, l am in the process at the moment of getting a rifle that will be moded so very probably the bipod will become redundant.