Yeah it is the ICS receiver, no problems installing anything except it was a tighter fit for the new outer barrel compared to the stock ICS barrel.
The RIS fit really snug/tight, but that is a good thing imo... Literally kind of like a perfect fit
Mine is the SW M&P 15 version...
I don't have my crane stock yet (Getting it Feb 28 along with some other stuff), but i moved the existing front wires to the rear to test.... The Hop-up was modified, but works no problem...
Also the bottom closes properly so no fitting issues after installing the rail either...
(Got my silencer today, and it looks awesome :P I guess I will have to get a longer backup inner barrel for when I use the silencer...) I got the short one so it is easier to bring around :P