In another thread, AlphaGhost mentions tha benefits of installing the free-float type handguards, and he ends the statement stating that there are drawbacks.

Getting ready to build my first, I was pretty much sold on FF guard.  I read the tacked threads and they look simple to install, and it seems the lockup is steady enough that it won't take much abuse.  But before I make a solid decision, I'd appreciate it if y'all might tell me a few of these disadvantages.  Obviously they cost more than regular gaurds, but what else?

Thanks!

thred asking the same thing here

Ah, thank you kind sir.  Wonder why it didn't show up on search?  Weird, search usually saves me the embarrassment of replying to a post like yours.  Oh well, can't always explain everything!  Thanks again bro.