I've had a few of these NOS coachwood forends and one definitely had an allignment problem. But rather than warped, it seemed the profile machined for the nosecap, was off centre to the barrel channel, by quite a significant amount. Was never going to work. A friend of mine who has quite a lot of these stocks put away, has one same. Factory rejects?
I dont know, it seems to have all the right service marks stamped into it and a barrelled action seems to sit straight in the channels.
How anyone gets to put a lot of these stocks away? where do people find these things!