A well bedded barrel is an asset, for sure. Most peeps are either mounted on the tang, or on an extension coming off the barrel, so that if the barrel is removed, the sight goes with it.
If your barrel uses a Hooked breech, that hook should fit up solidly every time, and then the tang and barrel should be bedded together in the stock together, so that when the barrel is locked down with stock pins, or keys, it returns to the same position every time. The makers I know use Acraglas to bed these barrels, and they have great success in producing barrels, where the sights re-alight accurately everytime. My one friend actually shoots the guns after bedding, removes the barrel, then puts it back in the barrel mortise, and shoots another group to see that the barrel does return to the same position. This is all done before he returns the gun to its owner.
You might be surprised at how many guns are taken in that are poorly bedded, loose as a "goose", and in need of some major help just to get the guns to shoot adequately with the factory sights. Only after these major problems are corrected, do the smiths even begin to think about mounting a peep sight. :thumbsup: