Well I was pleasantly surprised when I went to field strip my new 556 and found out it is now nice and easy, right from the factory! The front pin is now just like the back pin. (Mine is a Swat Patrol from Dec 2009.)
The back pin I could push out with my finger, but the front one required a little help from a small screwdriver handle. I'm sure it will soon loosen up and require no tools. I like that the pins are captive, less parts to keep track of.
Good job Sig. (I wonder if they monitor this site, it would sure be in their best interests.)