Any stock can warp
A lot of people believe that their synthetic or fiberglass stocks can't warp due to the weather, but they are very wrong in this belief. Any stock can and will warp. The difference is just how much they will. A wood stock can change POI if it is left touching the barrel and the stock warps in that direction. If it is free floated, it may just let you get away with a little warp. Like earlier stated, the laminated stocks ten to warp less than a normal wooden stock because of the way the layers are stacked up. You can get a good piece of Walnut that won't warp very much if you check it to make sure the grain is very straight to begin with. Synthetic and fiberglass and rubber overmoulded stocks can and will warp due to heat and moisture. Don't believe me, try this one. Lean the gun against the wall with the barrel leaned over at about a 45 degree angle outside on a hot day or a very rainy day. If you let it sit there for any length of time and check the forearm, you might just see that it has moved one way or the other just like that of a wood stock. It normally does and most folks just never notice a change in POI, but it still can and will move.