The BT23 Atlas Ski Feet are easily installed to any V8, PSR or CAL series Atlas Bipod with the press of a stainless steel plunger. They will lay flat in the 90 degree position only. The BT23 delivers a fully articulated smooth foot to support the bipod. They will also fit bipods/adapters that use Atlas feet. Sold as a pair. Available in black only. NSN 1005-01-640-8881