Good deal! I did mine with a chainsaw file, couldn't find my Demel, works slick as snot too. I did find the Dremel though.....I know this is old news, just proud of myself and need to toot my own horn!!! Been wanting an Auto Bolt realease for a while now. But as I looked at the aftermarket ones, I notice it and the stocker were very similar. So after comparing the stock bolt stop to an aftermarket one, I decided to modify mine and see if it would work... And it did!:yippee: I took a Dremel and a small round grinding/sanding drum, turned the speed all the way up and slowly started removing material. Then once the little hook was removed, I set the dremel speed to the lowest and smoothed it out. Feels nice to do something with my own hands and save a few $$$ by doing so. When I showed my dad how it worked in my gun, he asked me to do his!