I have been doing a little dry fire practice with my new 238 prior to being able to get out to the range and one thing I have noticed is that the bottom edge of the trigger is pretty sharp. I can see this getting painful after a long range session. I was thinking about trying to round off the bottom edge of the trigger just a little, but after looking at it, I'm not sure what material it is. I think it is aluminum, but I have also heard that the Sig 238 triggers are polymer. Anyone know?