I didn't realize you had a separate post on this issue, so i copied my response, hope this helps:
Quoted: Curious to see if your RAS II fits like mine does. I just bought it recently and after installing it as per Knights instructions I noticed that it has a little bit of play to it. Is this inherent in the free floating handguards or is it particular to the RAS II. I have a CQD vertical grip installed and when I rock the grip back and forth I feel the RAS shift in the front where the bottom handguard inserts into the top handguard. I can do the same thing by just grabbing the two handguards all the way to the front and squeezing them together with my fingers. Just a very little amount of play but I wondered if it was normal. Thanks.
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That is normal for the area you described. For the benifit of those who don't have a RAS II in front of them to refrence, this is the area toward the muzzle, where the lower handguard is retained by hooking (more or less) into cutouts in the upper handguard section. The rear of the lower guard can either be retained by the force of the delta ring (like regular HGs for quick removal & swap to an M203), or secured by the clamp to the barrel nut.
This lower section will have some play in it because regardless of the rear clamped area, the front is only hooked in. The one-piece top handguard should be
absolutely rigid, as it comprises both the top rail (for optics/lasers) and the side rail. (lasers/lights)
I noticed this too the first time i took mine out, but not to worry, this lower section does not have to be absolutely rigid unless your using a laser mounted on the bottom rail.
Tex78