Quoted:
Basically he needs a handguard set that preferably incorporates the EXISTING front sight post.
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Just to clarify, he doesn't want to remove/replace/shave down/alter the front sight in any way?
In that case his best bet is one of those 2-piece drop-in rails, they sell them anywhere from amazon to your local gander mountain/cabela/dunham/whatever for about 20-25 bucks.
I have one on my PSA 16in carbine, works great, fits great. One end goes into the delta ring, the other end into the fsb ring, simple drop in, lower and upper halves held together with allen bolts. No alterations to the gun whatsoever.
Now, if he wants a free-float, then the fsb has to be modified. As in, shaved down to becoming just the gas block. After that, the world is his oyster. Dozens of hand guards out there, from basic quad rails for 50 bucks, to fancy super light keymod/mlok/whatever for hundreds of dollars.