Hi Morten. Don`t believe everything that you read in books - especially as the books are having to be revised at a remarkable pace at the moment. Daniel Fraser might have built every part of his earlier guns but by the turn of the century the company was definitely buying in guns from other manufacturers. I`ve had a c.1900 Fraser shotgun apart and can assure you that it was all Mortimer. Daniel Fraser shotguns are rarely encountered and the few that I`ve seen have all been of very high quality - like all Daniel Fraser guns ( especially if they were built by Harkon/Mortimer

) I`ve never seen a sidelock shotgun but have heard of them - obviously very rare.