ok hypithetical question here. what if i came across a vortex flash hider for $10 but it was the .636 depth not the .7?? one its not a suppressor mount so why couldnt i use the factory nut behind it. i know there will be a gap between the barrel face and the shoulder of the flash hider but its like .1 but my question is why can the pws be mounted like this but everything else cant? or can i grind the nut down or the back of the vortex (on a surface grinder) to make it fit like the pws and make the vortex locate on the shoulder.