This is a High Ground Bipod the legs can be extended up to 15 high. This bipod has a huge advantage over other bipod because you can use at any ground level. RAP4 HG Bipod can be mounted on any barrel. The bipod is made of 100% metal for long lasting use and abuse. - 100% metal construction - easy to install - improves aiming - more steady shot - compatible with most guns (excluding US Army Alpha Black original barrel kit)