I know various fillers, strengtheners, and stabilizers are added to synthetic stocks in the form of glass, carbon, and/or kevlar fibers, but synthetics... plastics, are notorious for expansion variances, often much greater than wood, with temperature changes.
I count myself fortunate or lucky. To the best of my memory, I've had Wby Fiberguard, Rem Syn, Win Syn, Ruger Syn, & Tikka Syn stocks. I can swear that NONE of them have shifted POI in temperatures from 80* down to 0* or even -4 & -8*.
Klik, I'm not trying to dispute/argue with you but this has been my real life experience. I'm not sure synthetic = plastic.
Jerry
