I don't quite understand this one, Sound Moderators are sweeping the country and demand is strong...many rifle barrels need shortening or the balance screws up, hence why Tikka, etc are now all arriving in the country with SHORTER Threaded barrels, far from devaluing the gun I would suggest it will enhance the price!
A valid point the Tikka's are coming in with 20" barrels so I assume cutting down by this amount should be ok are the twist rates the same though in the newer shorter barrells?