Take a look at the Echol's Rifles blog site. There is an image of a pillar placed in a wood stocked rifle that is similar to your situation. It may provide you with an option.
DPV
http://echolsrifles.blogspot.com/search?updated-max=2013-04-12T20:17:00-07:00&max-results=7&start=7&by-date=false
