I apologize if there is already a thread for this, but I couldn't find it. I recently purchased a M&P 10 from someone who moved to my area from California. The rifle had a bullet button. It's not need in my part of the US, and I would like to remove it. Is this something I can do myself or so I need a gunsmith? If its something I can do myself, any suggestions on where to purchase the part? Thanks in advance!!