Harris Engineering Bipod, Rotating, Black, Leg Notch, 9-13 S-LM M-LOK The Harris S-LM Bipod M-Lok Mount 9"-13" is perfect for prone position or bench rest shooting. This compact and light bipod raises the barrel height from 9 to 13 inches. The bipod provides noted legs in 1" increments and are spring loaded for fast deployment.