The excellent Harris bipod mounts to QD swivel studs on bolt action rifles for ultimate field accuracy. Won't change zero; added weight steadies gun. Spring-loaded, telescoping legs adjust quickly, fold parallel to barrel for carrying. Series 1A2 bipods have solid base and do not swivel or rotate. Series S bipods rotate 45° for instant leveling on uneven ground. Buffer springs and adjustable tension on hinged base help eliminate tremor. LM models have leg notches to hold the leg in position anywhere in the 9"-13" extension range.