How to remove stripped screws?

I bought a used tippmann and i am having trouble removing the screws from the foregrip and the one by the safety, I have stied and tried and now ive stripped the screws, how the hell do i get them out?! I need to clean my gun!RAR!!!!

Theres a guide on it in the sticky.

In a nutshell you take a dremmel and cut new groves to unsrew them and replace them.

You can order new screws from tippy or you can take them to your hardware store and have them match them for you.

do what Darur said. cut little slots to a flathead screwdriver will get them out. i don't know how soft the screws actually are but if you don't have a dremmel or something like that,  you might be able to  pound a very small, sharp flathead into it. sharpen i on a grinding wheel so it charp like a chisel. then hammer it in slowly, be careful the nothing breaks, like the plactic tigger handle. it might work, but as a last resort

also if u have one of those engraving tools u can make new grooves easy. just be carufull how u make them cause u can screw it up and then u need to drill em. a paintball shop will do it for u they prob got those damaged screw remover bits. 

yeah i had that prob before i used the dremmel and cut new groves fer a flathead screwdriver...then i ordered more from tipmmann.  its easy....the try using the chisel and pounding grooves doesnt work well that was my first..or paln a then i moved to plan b..the dremmel