CarloBear

I managed to undo a pistol grip screw that I'd stripped with a square head. Give that a go maybe?

Be careful with all the screws on Krytac, they are notorious for their screw quality, Krytac official forums are full of threads where people are stripping screws. 

I stripped screws on the motorplate, then the actual pistol grip,

I used torx head and hammer it in to the stripped screw, then got it out,

replaced all the stripped screws with torx screws. 

Yeah got decent tools, soon as i started twisting it went through it like butter. Thanks for the advice everyone