A far better solution is the GG&G Extended Tactical (ouch, that word is SO overused) Latch. It extends the LEFT side of the charging handle, so that you don't have to move your primary hand from the pistol grip. It's very easy to operate with your left hand, and also helps greatly when using a scope on your flattop, yet is not so big that it's obtrusive.
[img]www.bushmaster.com/shopping/uppers/Images/1005-249-02.gif[/img]
-Troy