I just received these yesterday and have no trigger time with the carbine as it's set up now, but first impressions.....nice weight savings.
I removed two rail sections, one for the Larue hand stop and one for the scoutlight with gear sector mount....If I were to have removed the gear sector mount and run the light direct on the rail, I would have shaved a bit of weight without any of the changes. All I can say is that the change is noticeable. How much of a weight savings? God knows.
Only con is that I did like running the light at the 10 o'clock/2 o'clock positions. With the Troy front sight, I can't run the scout at the next notch up...not enough clearance...may need to replace that front sight.
ETA: after seeing my post I was contacted by IWC directly with some pics of how to properly mount in the 1 o'clock position (which I referred to as 2 o'clock) will be remounting this weekend....maybe sooner
At first looks on line, I wasn't sure that I'd like the IWC hand stop, but so far I like it.....only trigger time will tell