I contacted brownells prior to posting. The only spring the have available is the wolf+25% they used to carry a wolf -25% and until recently benelli supplied the factory standard. Well benelli recently discontinued the hk sbe sping. I contacted wolf and they are going to begin work on a factory standard spring. Apparently our problem is common. I am not bad talking wolf springs they obviously recognized that the factory standard was not sufficient for every gun. Nor was it necessary for others. That is why they covered the bases of stronger and weaker than the factory standard. My gun likes the factory standard. I shoot federal 1/1/8 max dram lead eights every Tuesday and have for many years. When I put the wolf spring in was the first time my clean and well maintained would not cycle them. It does a good job of closing on 3.5 waterfowl loads which is why I changed in the first place. But it worked great from new to this year. I personally wouldn't mind changing to a new spring yearly if it makes the difference. I paid enough for my shotguns I don't mind maintaining them. I just want it to do what I do. So the question remains where do I find a factory spring? For hk sbe