So I had Mark Pharr put together a 6XC for me last year on what was previously just a factory varmint rifle. The build has turned out to be everything I could've hoped for and more. Now... that said, I'd like to start getting a little more serious with it and do some prone shooting, informal (or even formal) F-Open, etc. However, the angled buttstock is going to be a problem. Has anyone ever modified a standard angled buttock or added a block at the rear to provide a wider, level (and parallel to forearm) surface to ride in the rear bag? (If such a mod/attachment is even legal under the rules) There isn't a lot of aftermarket for this particular rifle, so it's either I run with what I've got, modify it somehow or *gasp* order a 96% inlet Benchrest from Richard's Microfit... and I'm no woodworker.
Thoughts or suggestions?

Thoughts or suggestions?