Quick Disconnect (QD) Couplers replace OEM feet and enable users to rapidly switch between Rifle Sticks Accessories via a pull down collar. Still want to use OEM rubber feet? Simple, add the OEM feet adapters for your application to the shopping cart. Want to use spiked feet? We have those as well. Note: In order to use the factory feet supplied with your bipod, you must also purchase the adapter specific to your bipod. All OEM adapters are a universal fit for QDs, meaning you can run Atlas feet in a Harris bipod and visa vera.