Newbie question:  I am considering putting a rail system on my 14.5" m4 config rra. I would like to mount a grip and light only on it. In your opinion- will their be much noticable difference in accuracy at 100-200yds with one over the other? It has M4 handguards on it now which I assume are non-free floated. I am more than happy with the accuracy in its current configuration, but would like to make it look cooler and put a light on it.

Thanks

For a budget buy: go with MI
For a purely quality buy: go with DD or Larue

The accuracy bonus which the free floater offers you isn't all that much.  And if you are happy with the current accuracy, why change a good thing?

IMO the difference in accuracy would be negligible, buy what you can afford and what you want. That being said I prefer DD