PSEBO

From what i have heard the trophy ridge mantisguide/hunter v-drive sights can lock downto keep the pendulum from moving. Thus it becomes a single pin sight for when you hunt on theground.The pin canalso move up or down to accomadate different yardage shots on the ground.
Here follow these directions to get to a web page that talks all about it
1. Go to www.become.com
2. In the search bar type in trophy ridge mantis pendulum sight
3. It should be the second web page listed. Its called "Mantis and VDrive Sights"