I built a couple of my 870's for Tactical games and find the pressure needed to load the mag tubes to be excessive. I have tried using the stock springs in an extended mag and even clipping some more off and I am affraid to go to far so that they will not feed. The Mossbergs seem to be very easy to load the tube. I guess that I will try some Mossberg springs in my 870. Anyone exprerience the same thing? What did you do?