The Caldwell Bipod Pivot Lock for XLA Bipods is exactly what XLA Bipod owners have been waiting for. The Pivot Lock works on all Caldwell XLA Bipods and several other brand bipods by replacing the thumbnut with its included 10x32 threaded adapter for SAE threaded bipods. The Pivot Lock allows you to easily lock the bipod pivot in place or flip the lever and pivot on target. The lever is spring loaded, so you can pull out and position the lever to your liking.