I recently did a shooting course with my 10mm. After about 200 rounds, I noticed a very tender spot developing on my left thumb. I finally realized my Glocks mag release was causing it. The sharp edge of its square"ish" design and the deep grooves cut into it were acting like a plow, digging into my thumb with every shot. The instructor noticed me examining the spot, and when he asked what was up, I told him. When he asked to see my gun, his first reaction was "Wow...Where did you get that release?" He was more shocked to find out it was stock and still stuck out that far from the frame. My point is I am considering modifying the mag release, but not sure the best solution. It's not the distance it sticks out from the frame I want to change, but rather remove the sharper edges. I've tried looking for mag releases online, but only found standard glock replacement parts or extensions. I've thought to maybe sanding the edges for a more smooth feel, or gettin one of those gun shops that customize the frames to modify it. Has anyone else had this problem with your mag release? Know of any way to fix this issue? Is there any reason I shouldn't fix it and suck it up?