I bought an extended mag for my Remington 870 SuperMag (handles the 3.5" shells too). Problem is: with the extended mag, the orange follower gets stuck on two small indentations at the very end of the original mag; therefore I cannot actually get any extra shells into the magazine. What's the solution...should I grind out the small indentations to allow the follower to pass that point? Is there any downside to doing this? Or, is there some special follower I need to get to make the extended mag work? If anyone has dealt with this, let me know your thoughts! thanks.