A screw-mounted, removable PVC block to accept bi-pod or to keep leather sling away from stock and in straight line back to forearm for wrapping slack, for off-hand and kneeling positions.
Others had folding-down forend as unipod:
100 posted on 02/28/2014 8:24:46 PM PST by Carriage Hill
(Peace is that brief glorious moment in history, when everybody stands around reloading.)