Ive broken the spring in my nova tube, dont ask me how i did it Anyways, its not really easy to get a new one here in Norway, but 870 springs are more easy to get. Can i use this in my nova? Both are 12 g, 870 is 3" and Nova is 3,5". Also have to say i like the 870 better than the Nova, even tho its 870 express. Go American!