Has anyone else had trouble dealing with Kriss while registering and converting the carbine to an SBR? My buddy was told by them to cut the barrel down with a hacksaw once he received the stamp. Then after he cut the barrel down, send it to Kriss to remove and install a new barrel for $450!!!? He informed to me today that Kriss then told him that thennegraving he had done was not sufficient because it was in polymer. I was very interested in purchasing a Kriss but now I can honestly say I'd rather go any other route. What are your experiences with the company and their products?