[joker, the frickin ninja]

I have a G&P M4 (my first M4 by the way) that I am trying to take apart since it has ceased to function. I am trying to get the pistol grip off, but there are two small hexagonal screws at both ends that I just cant seem to unscrew. I am using a T9 torx wrench, which seems to be just right, and nothing is budging. It just seems that the screws' edges are wearing down.

Am I doing something wrong to take off the pistol grip or what?