Update on this. I spoke with Mr. Eric the owner of Galloway Precision & he told me he would look into a H/D magazine spring for the SR series Rugers. He sounded very sincere & told me he was going to have his spring shop look into it asap. How many of you would be interested in this mod for your Rugers.
I don't own that model of pistol but I believe he would sell some. A while back a fellow was looking for a magazine spring for the American .45 pistol. No one seems to be making them for the more recent models.
I don't know the fellow from Galloway Precision & have not done business with him. He used to post here some when he was starting out with his company though.