Just received mine from Ed at Warped Sportz. This thing rocks, out of the box it raised my FPS allowing me to lower my HPR. The stroke is also significantly smoother, and it looks just sick. In all honesty I think it might actually be heavier, but I can't say it bothers me. Also my LE has a serial in the 1000s and it didn't need any sanding. I think that might have been just a rumor.
System X NME LE: Graphite/Black Dust
Bob Long Regulator, Evil Front Block and Alias LPR
FBM Factory Delrin Trigger
Function Bolt, Feedneck and Slider On/Off
Now that we have two bolts available I dunno which one I want... I'm leaning towards the Function bolt, but I'm waiting to hear some reports on how well the Low Blow works in some ppl's NME's before I make my final decision...