I've used several RAR's with bipods, no problem. The most recent stocks are much stiffer than the originals, but even the early stocks worked fine with bipods, as long as the new owner made sure the forend was really free-floated, which sometimes meant 2 minutes work with a round rasp.

“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck