Folding legs have completely adjustable spring-return extensions except for Model LM. The sling swivel attaches to the clamp. Time proven design and quality manufactured with heat treated steel and hard alloys. Bipods have a black anodized finish. Series S Bipods rotate to either side for instant leveling on uneven ground. Hinged base has tension adjustment and buffer springs to eliminate tremor or looseness in crotch area of the Bipod. They are otherwise similar to non rotating Series 1A2.