there's a sticky on this - basically, you need to undo and remove the setscrew in the front of the front sight, then undo the castle nut, and break the welds except i have described it backwards- break the welds first- sometimes you get really lucky and the welds are minimal or none at all- but for mounting a new stock you don't need to take the flash hider/front sight off- unless you don't like the looks of the thing or want to mount a vortex or something