TS-13 Scar UD guide rod
 

I guys, I bought this Undi Directionnal valve guide rod to try something different then the RA-Tech NPAS. I have some questions about it. First one, I didn't find a video installation of it even if on the package it say to go on their website www.ts-custom.com for it. So I looked at the UD M4 one. In the ideo, they remove, easily, the yellow rear of the valve head. I tried with plier like in the video and even with using a lot of strenght, it didn't move at all. Should I give even more strenght to it? Second this is the big rear lock for the bolt carrier. I tried it and it doesn't feel ver locked, I can't screw it enough at my taste, I'm afraid it will unlock with time. Third, what is the size of the allen key for the adjusting knob on the guide rod? Even my smallest allen key is to big? Thank you :)

http://www.ts-custom.com/upload_images/36file5

YouTube- Tscustom: Installation of UDGR for WE M4