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No , that is the proper way to remove the bayonet lug . A few things to look for at first . You really need 4 hands & a rifle vice to hold it . There can be accumulated dirt or grease under the spring . You really have to hold down hard on the spring & tap lightly on the center lug with a piece of wood . The second person needs to hold everything steady . Before doing that , look to see if it has a welded on barrel extension ? If so , look at the corner where the nosecap meets the barrel . If there is a slight radius in the corner , the nosecap cannot pass by it . Sometimes the turning tool that removed the weld broke down on the corner & left a ridge there . Another problem is the weld being turned off center to the barrel . In other words , one side will be thicker & prevent the nosecap from sliding over it . In either case , leave it alone & never remove the bayonet lug , or put masking tape all around the nose cap & use a small triangular file & remove the excess metal until the nosecap can be removed . This will take a while , so be patient . A real pain , but that is what needs to be done . You may want to cold blue the extension when finished .

Assuming you get it apart , remove both band springs & scrape away all grease & dirt in the band cutout , so the springs will depress easily . That will make it easy to take apart next time .