My gunsmith charges around $25.00 and this includes the push pin. It will cost a lot more if someone damages the mag fence. Make sure the gunsmith knows what you want or has done several. I have heard a few horror stories here on the board. My smith was a tool & dye man for 20 years so he just made a jig for drilling the hole. With that almost anyone could do it. Spend a little time and do a little research. You won't regret it later.