Thanks for your kind reply. I understand it is neccesary to shorten the cylinder, the rear end of the barrel or both in order the cylinder to fit - I have investigated in Internet and found that diameter of the cylinder I have is the same for N frame. What I am not sure is if a "New Style" cylinder for a S&W mod. 27 or 28 could work (after shortening) in a S&W 38-44 Heavy Duty because of the difference in the extractor/star, etc. Where I live I did not find any piece to compare neither found any gunsmith to ask because there are no gunsmiths with knowledge to this extent. The face of the cyl I have is flat with no cut for the rim of the case.