I reduced the side rails by approximately 2.5", just short of the spring detent for the barrel extension bolts. Additionally, I trimmed 3.5mm off the rear rail bolts so that they sit flush with the receiver. I'm running Larue Tactical Indexing clips on the bottom rail to keep the hand of the "heat sink" while providing the slimmest possible fore grip area. I will take them to the range tomorrow to see how it fairs.
3.5 MB Views: 221
3.1 MB Views: 293