I just installed the Dawson ICE on both my 9 & 40 5.25's
According to Dawson's web-site it's suppose to fit the box Going to the range tomorrow evening for our weekly IDPA match and going to check to make sure
I got the +.100 base pads for the 9mm (also suppose to fit the box) and they do extend just enough below the magwell and got the extended + 3 rounds for the 40 for limited
The factory base pads will not work with the ICE magwell
Only had a chance to try them once at the local indoor range...I think I'm going to like them though